Don't know if this was brought up before. I could not find a reference to it during a search.
According to the *A site the *A members are offering a 55,555 mile bonus if you fly 5 *A airlines in 55 days.
See
http://www.star-pr.com/aweb/n.asp?ID=aaaaaaaaaaaaabm
and
http://www.flyertalk.com/forum/Forum82/HTML/000796.html
If this is true UA should be announcing details very soon.