It appears that Kings Lynn Museum may be the final resting place, with the Mary Rose people using their expertise in the preservation process. Can't find it at the moment, but I think I read somewhere recently about the planning for a respectful display at Kings Lynn being in an advanced stage now.

http://www.eastmidlands.info/flagfen/seahenge.htm

Got the Seahenge book by Francis Pryor for my birthday and looking forward to a good read.