BMW is reportedly going to unveil the all-new M3 sedan and M4 coupe tomorrow, but here's your first look at the new high-performance versions of the 3 and 4-Series. We've seen several spy photos of the BMW M3 in the last few months and the BMW M4 was previewed by the M4 concept earlier this year. In true BMW fashion, the M4 concept and production models are nearly identical. Although BMW hasn't released all the official specs for the 2015 M3 and M4, we do know that they will be powered by a new 3.0L six-cylinder engine with around 430 horsepower.

What else do we know about the new M3 and M4? BMW managed to put the new models on a diet with the new M4 coming in around 3,300 pounds, which is closer to the E46 M3. The M3 and M4 will also get a new seven-speed dual-clutch transmission and let's hope that a six-speed manual will still be on the order sheet.

The 2015 M3 and M4 will debut next month at the Detroit Auto Show and will then start trickling into showrooms a few months later. We'll have more information tomorrow as the new M3 and M4 will officially be added to the new Gran Turismo 6.

Be sure to check out the new BMW M3 and BMW M4 from all angles in our slideshow above!