Jonas -
We haven't set a hard date for the full UI integration with Umbraco but I can tell you that the project is in active development and will require v4. (of course the current release runs with v3 also)
There aren't any issues per se, but many folks have noted that Commerce for Umbraco is User Control heavy (for an Umbraco extension). If you're used to doing UI via XSLT you'll not find much support for it with Commerce for Umbraco currently. The XSLT-Extension for Commerce for Umbraco is also an active project and will be released when it's done -
If you have specific questions, please feel free to contact me (
info here).
Also, if you're keen on joining the project please do so. It's on
CodePlex.
Cheers,
-Paul
motusconnect.com :: level-2 certified :: MVP 2008/2009