That weekend I would do sunday b/c it will be as far away from the new Star Tours opening as you can get and the locals looking for merchandise will be out on Friday making it busier too, any that didn't make it will be there Saturday to scoop up the remaining stuff (and put on ebay at 1000% mark up).
But be prepared SWW are not kid friendly, adults will be around all the charecters skipping line, cussing and cutting up while in line, etc. It is hard telling a patient 4 yr old waiting for a charecter why he has to wait thru antoher 2-3 adults that just cut in front of him (and it's ever harder keeping your claws to yourself when someone does that to your child). Also Hyperspace Hoopla is a nightmare crowd wise and little ones can get shoved, stepped on, and tripped over. I hope they move it to a bigger venue this year it was downright dangerous last year to have kids in that crowd.