Before I say anything else let me make it clear that I have no more information than what is available in public domain due to me being a Sun/Oracle employee.
Now,
1. OpenOffice is not detaching itself from Oracle, it is restructuring itself. And there is a big difference. From what I read, Collabnet, the company which offered the web space and project infrastructure (and a long time partner of Sun) has decided not to continue supporting OpenOffice and so OpenOffice community is moving to a new web place.
2. Here is what was discussed about MySQL in Oracle OpenWorld which got over not even 2 days back:
http://www.oracle.com/us/openworld/mysql-sunday-078000.html and also you may be interested in seeing this.
http://www.mysql.com/news-and-events/generate-article.php?id=2010_04
IMHO, both OpenOffice and MySQL are here to stay.
Regards,
Abhishek