If Ed, whose sources have been spot-on with everything in the past, is to be believed again:
Apparently, the band turned down a 35-date tour offer from LiveNation for 2009 and told the crew to find other work until 2011, when they "should be ready to head back out." But, at least Ed says this farewell tour should be in support of a new album.
So far I've only been able to see one show on the 2007 leg of the Snakes & Arrows Tour (I know, I jumped on the Rush bandwagon late). I better start saving my money for 2011.