There are alot of mechanics with 3e that I'd like to see change, and judging by SW saga 4e will do that. I'm cautious about how they are planing to change the class structure.
Plus I'm heavily invested into 3e , and how easy converting material will be is a big issue. Most of the changes I'd like to see I can probably use as House rules. But I do wonder how easily I will be able to convert all the books/adventures i've got into 4e. If its easily done, I will probably invest in 4e, if its difficult, then its a choice between 4e and 3e, and 3rds going to win. At least while I can find a players that still want to play 3e.