OMG! I called this one. From Cez: It says
Kubo is concerned about the scene where ulquiorra disappeared into ashes
so that's why he put that kind of comment in Jump that week
the one where he asks for feedback
More info from a blogger here in a post at BA
eta: and finally we have the Rukia spine! Thank you to ANNIE! and another pic from JumpFesta showing the drawing Kubo did for Jump Bang:
eta: another image found by Mezz from Jump Festa. Can you spy with your little eye the sexy trio?