I don't think the Queen would allow a second divorce - well, not without a fight anyway!
I'm not sure Anne could be bothered marrying for a third time to be honest. Anne seems really independent. I could imagine her carrying on with her charity work and living the quiet life with her dogs and horses, her children near and future grandchildren.
I don't think we need worry about Camilla and Andrew being linked through family. I mean, is Andrew not happily married?
HOWEVER, no announcment has been made so I think I'll stop rambling because all this could be untrue and Anne and Tim may be happy after all?