It's possible this was answered/Brought up elsewhere, but I havn't seen anything about it!
The Unit Cap option in the Game Options Screen. (I'll take a Screenie when I get home, Damn work!)
Do you all think it has to do with the number of minions that Generals can have? Hmm.........
The options are for:
10
20
30 (Default)
40
50
Assuming these are what they will be when Generals are added AND assuming that it has to do with their number of units, it might let us know how many units we can expect from Generals!
(But we all know what Assuming does!)