This F83 M4 convertible spotted yesterday completes the M3/M4 trifecta.
As one can see, the F83 M4 will generally share the M4 coupe and M3 sedan's aero parts (and mechanicals). Even the trunk, which is of the automatically opening variety (to store the hardtop), appears to feature a similar CSL style curve. Parts such as the front/rear bumpers and mirrors may appear different than the M4 coupe, but that's due to the heavier camouflage which the M4 convertible still retains.
The one clear difference is that the M4 convertible features a different roof -- in the form of a non-carbon fiber folding hardtop. It will operate and fold in the same manner we're used to seeing on the E93 M3 convertible. We stitched together earlier spy photos for a preview video (reposted below).
This particular convertible M4 also appears to have traditional front seat, as opposed to the single piece sports seats seen in yesterday's
M4 coupe and
M3 sedan prototypes.
Unlike the M4 coupe and M3 sedan, the M4 convertible will not see its debut in January at the Detroit show, but later in 2014.
4 Series Folding Hardtop in Action