[Edi]

I'll be sharing this in advance since the implications are important for modders:

The progress page lists UID and description limits being raised for the next patch. The new upper limit is going to be 3999 and modded monsters should start no lower than 2300.

That gives a margin of 217 more new units IW can add in new patches without stepping on modders' toes and roughly 1700 unit slots for modding. Should alleviate the current squeeze on mod nations some.

The nation number limit is currently 94, whether anything happens to that is open.

There is also some more information on spell flightsprites: The number range is from 10000 (nothing) to 10257, which is obviously something. Go right out and test to your hearts' content, but if someone wants to do good by the modding community, test them all and document them much like the current weapon flysprite list in the DB is done.