Well, the rumour is that ID 2.5 or 3 will be out by June, but it's just a rumour (started on the Quark forums, I believe!)
I like ID from a design perspective, but having used it on a couple of jobs, one of them very production intensive, the overall feeling I get is that it's like Pagemaker with bells and whistles stitched on. It doesn't suit my precise, speedy workflow although it's good to get great proofs without using the RIP thanks to OSX.
Whether it's hollow or not, I'll still be one of the first to buy the Xpress 6 upgrade.