Personally, I'm starting to be in the market for an upgrade for my venerable 500 -- I want something with ePub support. I'm planning to wait at least until 10/01, or until Sony brings out something new if that happens sooner. I really don't expect it to, for the reasons I outlined above.
I'm also keeping a sharp eye on the Plastic Logic device, but that's more of a professional interest, I consider it to be a bit big for casual reading purposes.
