If you couldn’t already tell from the torrent of spy photos featured on the BIMMERPOST homepage, manufacturer testing season has opened on the Nurburgring.

On the track today was this F32 4 Series (435i) with M Sport package revealing for the first time the aggressive shape of the M Sport front bumper. Compared to the F30 3 Series M Sport front fascia, the 4 Series M Sport bumper is more angular, with air vents that angle upwards and expands as it gets closer to the outside of the front bumper. The side shot also shows that it incorporates splitter fins which extend quite far out, adding to the aggressive look.

The lighter camouflage also reveals what looks to be Air Curtain vents in the M Sport … CONTINUED

Have a look at the latest F33 4 Series convertible prototype, revealing more of its defining characteristic - its metal folding roof. Earlier spyshots (reposted below) show the hard top operation and the design is largely similar to the current E93 convertible.

The F33 will share the same engine and transmission options as the F32 coupe, as well as the coupe’s general styling. So, imagine the coupe that you’ve seen revealed, but with this metal folding top.

Production of the 4 Series convertible (both 435i and 428i) begins later this year - in November 2013.

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Will we be seeing the F32 4 Series coupe make its public debut at the 2013 Shanghai auto show in just over a week?

These photos are purported to be production stage 4 Series coupes at the airport waiting to be loaded for a plane to Shanghai. They may look like they are wearing the usual pre-production prototype camouflage, but per insider Scott26, the camouflage is just protective vinyl for the trip.

Although the production 4 Series coupe has recently been spotted completely revealed [pics below], we have not yet seen the M Sport version (which is represented by the Estoril Blue 4 Series seen below).

The 2013 Shanghai auto show begins on April 20th. Keep your fingers crossed

For the latest in 4 Series news and … CONTINUED

We have looked at the F32 4 Series Coupe against the E92 3 Series Coupe (comparison pics), now let’s look at how the 4 Series Coupe looks against its most direct competitor in the marketplace - the Audi A5 Coupe.

Compared to the A5 Coupe, the 4 Series Coupe in concept form is:

+ 0.6 inches (16mm) length
- 1.8 inches (28mm) width
- 0.5 inches (12mm) height
+ 2.3 inches (59mm) wheelbase

Note: these are calculated using concept (not production) 4 Series dimensions.

As for the aesthetics, well, that’s subjective of course, but we think that overall (except maybe the front end, which still isn’t totally clear in the spy photos) the F32 looks sportier and more athletic than the A5.

Now that we have seen the production 4 Series coupe fully uncovered, a natural comparison to draw is between the 4 Series coupe (F32) and the model that it succeeds, the 3 Series coupe (E92).

We do not yet know the official dimensions of the production 4 Series coupe, but for reference the concept 4 series dimensions are:

1.6 inches longer than E92 3 Series coupe
1.6 inches wider than E92 3 Series Coupe
1.3 inches lower than E92 3 Series Coupe
1.9 inches longer wheelbase than E92 3 Series coupe
1.7 inches wider front track than E92 3 Series coupe
3.1 inches wider rear track than E92 3 Series coupe

Note: these are calculated using concept (not production) 4 Series dimensions

We have updated with even more photos of the BMW F32 4 Series (435i) coupe in Sport Line, showing even more angles. Enjoy!

Caught during a night time photo shoot is this production F32 4 Series Coupe, which gives us the first ever look at the final (and uncovered) 4 Series!

This 435i coupe still looks unique, sleek and sporty despite its toned down front fascia, rear bumper and side view mirrors designs (compared to the concept model). The unique tail lights from the concept version also have not been carried over from the concept. The headlights seen here are the optional full LED headlights.

This appears to be a Sport Line 4 Series model. The wheels are the optional 19″ Style 407 wheels.

Also as expected, we now see the functional air breather vents in the front fender, which began appearing with the 3 Series GT model and will … CONTINUED

U.S. BMW dealers have now received order forms for ordering their first demo 435i and 428i coupes (just as they did recently for the 2014 X5), and the forms give us a good general preview of the different lines, options and packages to expect for the 2014 BMW 435i and 428i (U.S. configuration).

Not much surprises on here, but it does show that full LED head lights will be available on the 4 Series (just as we spied up-close yesterday) and it may be equipped with the new 609 Navigation Professional system. There are also some new M Sport wheels options (Style 441M and 442M).

Like the F30 3 Series, the 4 Series coupe will be available in “Lines” but it does not appear to be … CONTINUED

We bring you the latest sighting of the 2014 BMW 4 Series (F32) Coupe. What we’re seeing here is a 435i Coupe showing clearly for the first time LED headlights and large parts of its interior front cabin.

The optional LED headlights feature squared off coronal rings (angel eyes) much like the optional LED headlights seen in other recent BMW models. Sadly however, the optional LED headlights will not feature the special design seen on the BMW 4 Series Concept’s LED headlights which featured hexagonal lights with the corona rings leading out from the inner headlight tube to form a visual link with the inner headlight and the kidney grille.

As we’ve already seen in past spy photos, the 4 Series interior remains close to the … CONTINUED