From what good sense tells me, here is how the ///M Performance range would fit into the whole BMW range :
1er range (3 door and 5 door hatches) :
- No 135i (either regular or ///M Sport)
- Instead, an ///M Performance 320ps
///M140i (or ///M135i
***)
- No ///M version
2er range (2 door coupé and cabrio) :
- 306ps ///M Sport
235i (likelihood in question
***)
- 320ps ///M Performance
///M240i (or ///M235i
***)
- 360ps
///M2
3er range (4 door sedan, 5 door wagon and 5 door 3GT) :
- 306ps regular version
335i
- 306ps ///M Sport
335i
- 340ps (like the Audi S4) ///M Performance
///M340i (sedan and wagon only)
- 450hp
///M3 (probably sedan only, wagon depending on demand)
4er range (2 door coupé and cabrio, 4 door coupé 4GC) :
- 306ps regular version
435i
- 306ps ///M Sport
435i
- 340ps ///M Performance
///M440i
- 450ps
///M4
5er range (4 door sedan, 5 door wagon, 5 door 5GT) :
- 407ps regular version
550i (later upgraded to 450ps)
- 407ps ///M Sport
550i (later upgraded to 450ps)
- 381ps ///M Performance
///M550d (sedan and wagon only)
- 560ps
///M5 (sedan only, wagon depending on demand)
6er range (2 door coupé and cabrio, 4 door coupé 6GC) :
- 407ps regular version
650i (2 door) soon upgraded to 450ps
- 407ps ///M Sport
650i (2 door) soon upgraded to 450ps
- 450ps regular version
650i (4 door 6GC)
- 450ps ///M Sport
650i (4 door 6GC)
- 381ps ///M Performance
///M650d
- 560ps
///M6
7er range :
- 407ps regular version
750i soon upgraded to 450ps
- 407ps ///M Sport
750i soon upgraded to 450ps
- 381ps ///M Performance
///M750d
X5 and X6 ranges :
- 407ps regular version X5 and X6
50i (later upgraded to 450ps)
- 407ps ///M Sport version X5 and X6
50i (later upgraded to 450ps)
- 381ps ///M Performance X5 and X6
///M50d
- 555ps
X5///M and
X6///M
X3 and X4 ranges :
It is too early to speculate but I guess that both will get ///M Performance versions (340ps
///M40i) and the X4 might get its hardcore 450ps
X4///M version.
Z4 and Z2 ranges :
I really hope we will get 450ps
Z4///M and 360ps
Z2///M (although Z4///M seems unlikely on the actual generation), and logically the facelift Z4 35is will become the 340ps ///M Performance
Z4///M40i.
...But again, all this is only my imagination so far
***PS: as mkoesel pointed it out, there might be no 306ps 235i at all but only the 320ps ///M Performance version replacing it. In that case, the latter might well be called
///M235i and not ///M240i since the -35i suffix will be free to use, and therefore the 3 and 5 door hatch versions might be called
///M135i by extension.