You can't buy the Evolution without buying the Rock+/DVI as well. So I imagine that when the Rock Pro comes out, they will pair those two together instead. I don't know if that will change the price but I imagine so.
As to whether the Pro will fix the judder issue, I will believe it when I see it. Maybe we'll all get to see this at CES. I personally remain skeptical. After all, I think we are all aware that the problem is caused by the design of Hitachi's electronics, which the Evolution uses. So if their scaler can somehow fix the problem, so should a properly configured HTPC... and there's only so much you can do with a DVI input. You would think that current Hitachi owners (or for that matter, Hitachi engineers) would have hit upon the right combination of DVI settings by now, if any such settings existed. But who knows, maybe they've hit on something new. Like I said I'll believe it when I see it.
I still have the beta unit and as such am still not going to give a full review of the unit. In fact, since I may not get my beta unit upgraded with the latest fixes until well after CES, I may base my future comments more on what I see at the show. However since the judder is not one of those fixes, I will share my experience. The judder is there, though I find it to be minimal at 48Hz refresh and am not bothered by it. In fact I wonder if perhaps my unit is somehow better than what James saw.
Anyway, if you think you might be bothered by it, wait to see if the Rock Pro fixes it, or just go with something else. I guess in that respect it's kind of like the DLP rainbow problem. I think its a bit too dogmatic to assert that no projector at this price should have this problem. It's a value judgement like any other. Now I admit that at the Evolution's stated price it might be hard to justify, but Runco's aren't perfect either and they still sell.