I'm not promising any release dates, but progress is going quickly (I just finished the Stark roster), so I'm shooting for a few months. Still, we'll have to wait and see...
Edit: I have a job that needs doing, by the way, and fortunately it isn't too hard. Right now I have it so that a unit is only available to its parent faction in the "early" period for custom battled. In the "high" period its the same, but factions can also add mercs. The "All" period crashes due to hardcoded M2TW limits on the number of units that can be displayed (every unit is available to every faction on the campaign map, but that means the game tries to display over 300 units in the "all" period).
One fun thing I'd like to implement is a system where in the "late" period, a faction has access to every roster from its "kingdom". AKA, the late period Starks would have access to Bolton, Dustin, and Umber units, etc. This would allow for custom battles with a greater variety of units, and it would let people fight "civil wars" between the armies of a single faction if they wanted. If anyone is down do go through the units and change their "era 3" ownership to all factions in that kingdom PM me! It doesn't require a ton of skill if you're new to modding .