Have you read TFA? Notch offered to drop the trademarking entirely.

And while their attitude could (of course) change in the future, so far Mojang has only used trademark law in a single case: against a fellow selling a minecraft ripoff as "Minecraft" in the AppStore (which is about as clear-cut as you can be for trademark infringement). Not even FortressCraft[0], a blatant ripoff of the game using a very similar name structure and reusing half the trademark, has triggered any giving of fuck from Mojang (as far as I know, I might be wrong) although it has drawn the ire of the community.

[0] http://www.youtube.com/watch?v=bHdWswvezds&feature=mfu_i...