So I got an email in my inbox... I feel a little silly now, but on the other hand, it's good news for you guys. Turns out I WILL be able to continue to offer the 20% rebate on all of Holly Lisle's products! Yay!
So if that was your only consideration, you don't have to worry about the June 15 deadline. If, however, you wanted to take advantage of all the OTHER bonuses - well, you still only have until June 15 ;)