arg!, I also just got this ending a few minutes ago.
Captured a Harvester, Scout, Fighter, had 8 bases, some antimatter, a buncha captured aliens, was looking forward to some kind of escalation in the conflict and learning how to use Antimatter, Particle Beam weapons, Vehicles, Attachments, etc.
After several weekends of glorious play this is pretty disappointing. waah!
Hurry up and finish the next installment already!
In the mean time, has anyone made a 'sandbox' mod so you can just play the tactical combat part? maybe with a bunch of new maps? or even the existing maps, many of which i probably never got to see. *snif*