It is unlikely that we will see an M version of the Z4, but those who want a more aggressive look and don’t really care about the extra power can buy their new Z4 with the M Sport Package next year.
The M Sport Package will come with the more aggressive M front and rear bumpers. Also new exclusive colors and set of wheels will be offered in addition to the current ones. Of course M-badges will be inside and out.
Interior will see the typical upgrades like M-steering wheel, shifter and carbon fiber trim. The only expected under the skin change is a tighter suspension system. M-Sport Package will be offered very likely on the full range of Z4. The closest thing you can get to an actual Z4 M is the top-of the range sDrive35i with M-Sport Package.