I’ll try to elaborate.
MODx Revolution is on the way, and has been for a long time, but it’s definitely getting closer to release. It’s currently in Alpha 6, I think the next release will be a beta, which means it’s getting closer to a stable release. Nobody really wants to guess on when the stable release will happen, my guess is summer 2009 (but keep in mind that I’m not involved in the development, I’m just following it...).
The current MODx Revolution (Alpha 6) should not be used for production yet, unless you’re a hardcore developer badly needing features that you can only get in Revolution.
I’ve read somewhere (on the forums), that the idea is to make a tool for upgrading, which should be able to fix all snippet-issues etc. I expect it to work almost perfect for the default preinstalled snippets, but wouldn’t as much success for custom snippets.
If you have more questions regarding Revolution I suggest you ask them in the "MODx Next" forum under "Core Code", found here:
http://modxcms.com/forums/index.php/board,280.0.html