to answer your question, no.
The 4 series is not the M3 successor. It is however the successor to the 3 series coupe. So the spy photos and renders you see on the homepage are the non-M platform for the M3 coupe successor.
I agree that it's silly and should be kept 3 series and M3. But honestly, I couldn't care less what it's called, it'll be a great car.
Eibach Pro kit|Bilstein Sport Shocks|M3 Edition Grilles|Painted Reflectors|Matte Black Vinyl Window Trim|CF Performance Spoiler|35% Tint|19" Satin Black Avant Garde M359|Lux H8 V3|OEM Aero Lip|M3 Side Skirts|M3 Mirrors with Performance CF caps|LCI Tails|M-tech Rear|Duke Dynamics CF Performance Diffuser|Cyba 4.0 Black Chrome