I have not heard about the delay. BUT, I guess it would be possible since Jumbos have some cards seeded inside that regular does not. Maybe there was a boo boo made on some of the jumbo only cards. Who knows, just thinking outloud. But again, I have not heard about any delay.
Retail is already live, Hobby goes live next week, and jumbo the week following that. This is a bad move on Topps part unless there is some things in the jumbo worth it to those who bought case to break and sale early. I don't like it personally. I'm getting my information off the forums at Blowout and their Product Release Calander.
I'm going to have a hard time moving the stuff from my jumbo case it seems.