"M" To Head To The Caribbean?

It's been reported that Dame Judi Dench will be appearing in a cameo in "Pirate Of The Caribbean: On Stranger Tides", alongside the likes of Johnny Depp and Ian McShane.
It's unknown which character she will play, but it's also said that she may have a small love scene with Johnny Depp's on-screen father, Keith Richards. She may be Captain Jack's mother!