A formation-based bit of information we need is how to run Society Uns/Treys/Septs. It's hard to tell if the three-mech Trey is the formation to look at for SPAs, the seven-mech Sept...and if it's the Trey, is there any way for a Sept's commander(which is outside either Trey) can get any SPAs...there's an entire can of worms in there.
On top of that, it'd be nice to have rules supporting combined-arms formations, lances and stars and such with multiple unit types. Last I read, my impression was that proper formations had to be unit-pure, with the exception of Novas and Support lances. This can be an issue for units that go combined-arms by necessity(struggling mercs, backwater militias) or by choice(Cornstar, WoB).