Once again i disagree, seems like ppl are expecting reloaded to stay behind?
Why, there are always methods to get a directx based engine to work with other platforms.
A OpenGl wrapper like Regal
https://github.com/p3/regal/
could be used, now this one is not that stable but would be a start in the right direction for TGC when it comes to multiplatform and before ppl start
i know how intense such a thing is, the thing is that the base is already there
it is in the directx9 implementation, however a directx11 update would be much better when it comes to multiplatform.
and regarding DirectX 10/11
this might give some hints
http://blogs.msdn.com/b/chuckw/archive/2013/08/21/living-without-d3dx.aspx
And regarding Multiplayer, well the up to 16 Player Multiplayer along with different gameplay Modes in the Feature Votes is something that is totally possible.
On the first look we could even say its the minimum to be expected for Reloaded when it comes to MPlayer.
http://j0linar.carbonmade.com/