I´m affraid you will have to wait a bit longer for the release. There is really a lot to do, if you imagine that we have to change the units, for all cultures, make mercenaries, AOR lists, maybe (hopefully) change the buildings on the battlemap, maybe also on the campaign map, to some extent, though that would not be on my priority list, make or import new animations for crossbows, trebuchets and whatnot (big thanks to warman and GrudgeNL for that !!! ) , new coding to incorporate the new units and add them to buildings to be recruitable, create scripts for units to appear later in time and not just after , say, barracks level 2 or 3 has been built. Also we need new unit cards and UI, etc.
There has to be some testing as well before it can be released to the public, because the last thing I´d want to see is a great mod, that is littered with bugs and we have to "patch" it for half a year... We know how that felt before....
These are the major things, so there is a lot to do, but I believe it will be worth it. Just don´t expect such a major overhaul in a couple of months.
@Mortarion: As it stands, Slavonia and Bosnia will belong to Hungary and Vlach will be part of the Second Bulgarian Tsardom. Regarding the rest I am not quite sure