Folks in HK including one of my friend who POed got a call from HT saying the figure got delay because HT want to improve the sculpt but didnt say which sculpt.
I would think its the Cage sculpt.
I think the Ghost Rider sculpt actully. They already improved the Cage sculpt once and it looks fine. The Skull is what needed fixing and they seemed to have fixed it at the HK show.
But I imagine the bike has its own set of issues to work out as well. Its a complicated figure for sure. Lights and bike and all.