For me, it has to be the possibility of having the ability to increase the size of my units.
As S2TW is using the same engine as ETW and NTW, I don't see why the file layout and such should change either. While in RTW, M2TW, etc; had limits on the unit sizes/they couldn't be easily increased, ETW and NTW was quite simple to do
Just imagine, instead of having 250 odd soldiers in a unit... how about 500? or 1000? I have the computer to run NTW and ETW extremely well so this is what's got me stocked tbh
How about everyone else? What's the one thing that your most excited about in S2TW so far?