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This is going to be a "modern" MMO, like the popular World of Warcraft. This is not going to be a sandbox MMO, like the old Star Wars Galaxies. You will follow the quest lines, have zones that are meant for specific levels, do a lot of soloing, have a crafting system that's no more than a nice extra, have only combat classes, etc.
It's true. The only thing SW:ToR shares with SWG is the setting. The games will be nothing alike. If you have not played WoW yet, do so now, and you might be able to enjoy SW:ToR when it is released. I do hope we have a nice community with many SW fans, but if you don't get SWG out of your system you will be disappointed.