[Strategia_In_Ultima]

I think the reason Lucas's skipped the rest of the nine films he announced he'd make simply because of the immense quantity of newly-created information (the Expanded Universe, as in books and so forth) that either he'd have to
1. Stick exactly to the story in the (massive amount of) books, which would essentially be retelling an already told story, or
2. Contradict events/etc. from the books, which would make many SW addicts very P.O.'d.

On top of that, all the old vehicles wouldn't look the same anymore, because I don't think Lucas is going to use stop-motion animation and bluescreen models anymore, and all the vehicles would simply be "touched up" if they were digitally animated. I mean, just compare the EpII/III Yoda animation with the EpI/IV/V/VI Yoda puppet.