Two things I keep forgetting to mention:
It's looking like Eva Green has missed out on the role she was being considered for in the
Total Recall remake, so apparently she won't have to do any sort of schedule juggling to appear in it as well as the Depp/DS film.
Several reports are saying that Depp will be heavily involved in promoting Pirates 4 until May 20th and are strongly implying if not outright saying that he won't begin work on DS until after that date. However, that doesn't necessarily mean the film won't begin shooting until after the 20th. Depp is most probably in the vast majority of scenes, but I doubt he's in all of them, so production *could* begin without him. Unfortunately, though. it doesn't seem as if the start date is being reported anywhere on the Internet (IMDb STILL says April
- and myentertainmentworld.com's most current listing (which was revised on April 6th) simply says "May 2011".