Predictions are for an announcement tomorrow in order to tie in with the 40th anniversary of Star Wars Episode 4 premier.
If this doesn't occur then really it could be any date in the future as there is nothing else coming up StarWars related that would have significant merit to coincide with the reveal. If tomorrow's the day then we should see the banner heading on Sterns Facebook page get blacked out sometime today.

Tying into the 40th anniversary would make sense, however with the recent AC/DC Ve announcement, I think Stern is guided on production demands. Speculation is that the delays have been to give Aerosmith sales a boost. I call bs on this theory. To me it would make sense that they are trying to clear out current production runs for back orders on all older games before the manufacturing line is taken over by Star Wars. Probably released the AC/DC info before to gauge how much production time this title would need before shifting to Star Wars. As long as Star Wars ships sometime this year it would still be in the 40th anniversary , so really there is no need for Stern to announce untill they are ready.
Still worth checking in over the next 24-48 hours in case they do announce to tie in to the 25th of may anniversary.