I should think it wont be soon, though that's a relative term.
Its on the list though I don't think we have any details of how it will integrate or work at all as yet.
I would think adding it before single player mode it relatively complete and stable at the core may not be a good idea though I have no idea if for example it would be developed as integrated that may impact of the main single player engine or a kind of stand alone plugin if that's possible.
Enough on the TGC and Reloaded plate to contend with for a while I would think.
Anything other than single player and Windows PC platform is something to be given serious consideration, contemplation and planning and then careful development, integration and testing if it is not to be to the detriment of the main product which is the SP FPS engine.