Well, there are two icons, do I lost anything by starting Entrenchment instead of vanilla Sins of a Solar Empire? I guess I'm used to one exe for other games and their expansions...
No, you don't lose a thing. Entrenchment just adds onto the vanilla game.
Yep, you will find we do all our titles the same way -- each new expansion builds onto what its predecessor had to offer, so you only have delicious features to gain