Weird considering most brands are slowly removing the stick shift option from their lineups? Not really. It seems that the reason is because BMW wants to distance the M2 sufficiently away from its bigger brother; the M4.
Also, BMW is trying to market the M2 in a similar manner as the old 1M Coupe where it will be a simpler and less of a techno-fest car as compared to the recently launched BMW M3/M4. Don't worry though, you won't be feeling shortchanged because the M e-differential and and an estimated 350bhp should provide quite a lot of fun. Expect the car to be on sale somewhere in the middle of next year.