E46 CSL was a great car, an enthusiast M3!
Like the GTS is for E92.
So expect the F80 to be something like the E92 M3, but with a couple of turbo's, which makes it more easy as a daily driver.
Basicly it will be like the translation from E60 M5, to the F10 M5.
Again we should see a lighter car, not significant since the CF program isn't fully up yet, slightly more power, and about 30% more torque than the current M3.
But the 1M is where things are looking more exciting.
Remember M3 started with E30, a small nimble car, the M3 have grown out of this segment imo.
3 series: E30: 89 325i, E36: 92 325iC, 94 320iC, 96 320i Convertible, 94 320iaC, E46: 99 320ia, E90: 06 318i Le mans, E91: 07 318dt
5 series: E39: 97 520ia, 01 530Dat, E61: 09 520Dat
X series: E83 05 X3 2.0d , E84 10' X1 2.0 X-drive DA.