Or just a special release of The Division Bell for it's 20th anniversary?
Pink Floyd released a link to this fancy new site with a countdown, presumably a countdown to an announcement. Of course this has plenty people at full mast over the idea of a reunion concert/tour (get your tickets now! Only an arm and a leg for the cheapest ticket!) which seems like hopeful wishing to me but a site and countdown are a little much for just a special re-release as well.