This is an update from the same individual who did not know where the wall on Mickey Avenue would be going ....
First of all, nothing official has been said about Star Tours. I doubt anything would even start until next spring/summer when Toy Story Mania opens up along with Mickey Avenue. It probably would take awhile to complete, too.
Playhouse Disney is not going anywhere; They're building a large, temporary tent in the RnRc Parking lot to host the Playhouse Disney Live Concert series that they did last year. The Wiggles, Doodlebops and all the other odd acts for children will perform there in September/October which apparently will correlate with the RnRc refurb that has yet to be confirmed although we have been told in the Studios it would happen.
Playhouse Disney will eventually change, becoming Mickey Mouse Clubhouse which is rumored to include the talking heads and the obvious elimination of Bear and his friends. Rumors say that it will have Little Einsteins, JoJo and Handy Manny but we don't know anything yet.
And yes,
Block Party Bash will be coming next spring.