Well if anyone is interested, having seen how the game might work from a alpha tester I knew ---
The Y-Wings during the Hoth sample were basically in the game but they were not controllable. You had to basically maintain certain particular spawn points in order for the Rebels to " call in air strikes" in which flights of Y-Wings would enter the map and make bombing runs upon the approaching AT-AT walkers.
The X-Wings were controllable. The Tie fighters were controllable. The Speeders were controllable. The AT-ST was also controllable. The AT-AT's on other hand were not and if you were to choose to man it, it was on a time-based round in which you had about 10-15 minutes worth of AT-AT control where you could point the lasers and weapons around the map as it progressed towards the final part of the round unless the rebels were able to defeat them.
The way I saw they had it, you had to run around the map and find a vehicle token somewhere and when you walked over to it, you could thus engage the token and that is how you got into a flying or walking vehicle instead of spawn point rallies with ships and vehicles just waiting there for players to take.
You had a basic choice of weaponry from some strange looking MG42 like laser machine gun, regular blasters from the movies, ion torpedo shooters, jet packs, or personal shields/ ground mounted shield that over-cased a large area.
I would just suggest some people who are already hating the game to really wait and see, from what I saw, it looks really good graphically and although there were samples of the basic things you could do, it really was a pretty smoothly running alpha sample. The environments were realistic. The sounds and the different weapons used had authentic feel. When you traversed the Hoth battle you had Star Destroyers and Rebel Frigates duking it out in the sky. They had a quasi-sample of a " Survival Mode" where it was Co-op or solo playing in which you were to combat waves of Imperials with different stages of difficulty.