Starmark2k, you're right there is a Republic Landing Ship in there. This leads me to believe, along with the presence of SPHA-Ts on the cover of the PC Zone magazine promotion, that the Empire will have some units that are "left over" from the Republic era. This is a good idea in my opinion.
The later screenshots look quite good and not as cartoony and alpha-ish as some of the others. In particular I think screenshot 4 looks the worst.
I'd just like to state again how much I dislike the TIE Crawler's inclusion. It doesn't fit.