*EDIT*
Connetics came out with Q4 2005 earnings and this was news -- it would seem that it would be Q4 2006 for the foam.
In January 2006, Pfizer received FDA approval for Men's Rogaine® (minoxidil, 5%) foam using Connetics' VersaFoam® technology. Connetics owns U.S. Patent No. 6,946,120, covering minoxidil foam, which was granted in September 2005. Connetics anticipates receiving initial royalties from sales of both products beginning in late 2006.
If I had to guess, I would say the 10% foam would probably be better or at least equal to the 15% minoxidil currently out there -- if only because the foam promises better absorbancy thus (hopefully) better effectiveness.