Here is what I see would be happening at the announcements.
1. MeeGo intact. As per plan.
2. HP joins MeeGo. Qt to support WebOS too in the near future.
3. Talks about Alien Dalvik & Qt in the context of Android.
4. Collaboration/Partnership with Microsoft on key services. Gaming could be one of them.
5. Memo mis-quoted. That was just meant to be motivating the employees.

Now, anything other than that, I would be interested/hoping to see Elop getting fired right away, seriously. Now that WebOS 3.0 is also based on MeeGo, who else does Nokia fear to now? Qt is getting stronger day-by-day and it would be ultimate suicide to leave Qt and join WP7 even as a stop-gap arrangement!

So, in summary:
Nokia + Qt = MeeGo, Symbian^3/4, WebOS, Android (currently via Alien Dalvik), Linux, Windows, Mac
Nokia + WP7 = SUICIDE

Edit: In the mean time, you can start reading this article posted yesterday - Getting Started with MeeGo [linux.com]