Rob's being coy. Speaking from a position of no real knowledge whatsoever, I think the issue is that he needs to decide which features will hit in 1.9 and which need a bit more baking and so should be held to 1.9.1, which will be coming about a month or so later. But he did say that PM 1.9 will get something like "two dozen new features and improvements". Version 2.0 is still a little ways out.