I don't think many people know the answer... might actually be July for all we know. Just keep a watch on eBay, and one of the three big merchandise sites (SAFIS, SCS, collecting simpsons) will let you know when the first sightings are reported.
There's a good chance that that guy selling on eBay has a set. Don't poeple check my upcoming figures page ? http://figures.nohomers.net/upcoming.html Both the "Deep Space Homer" & "Homer at the Bat" sets are supposed to hit stores this month.