yeah, basically what kkmic said. as far as we're aware, all of the TFTD-specific functionality is already in place, and anything we do from here affects both games simultaneously, since they're both effectively "master mods" for the engine. if there IS something that affects one specifically, it wouldn't adversely affect the other, if anything, it would benefit - as is the case with UFO auto-recovery and right clicking to open doors. if that's your concern, rest assured.
that being said, however... yes, adjustments for tftd have been our primary focus for some time, as xcom has been "finished" since 1.0.