We've just released MR2 (though it may take an hour to appear on the labs page). There are a lot of new things in this release, including:
(i) WS-BPEL support. (ii) Web Services integration. (iii) improved performance. (iv) Oracle AQ support. (v) more quickstarts.
Take a look and let us know what you think. One note though: a few of the documents still refer to MR1 and the Release Notes document haven't been updated completely. Just ignore those (the release notes text file associated with the download is accurate).