It's very unlikely that any further skills will be added. If the decision to completely reboot the physics goes ahead, and if a very strong case can be made for a very small number specific skills, I may consider it; but definitely nothing on the order of magnitude that L2 has. In particular, no skills will be added that require any input beyond selecting the skill and selecting the lemming, so anything based on the fan or the cursor position can be ruled out right now. Even extra input as mild as that of the Turners in L3D is probably not going to be considered.