Chris Ryall has posted two alternate cover designs on his blog, and they continue to be awesome:
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Penning the story is Rob Williams, who has worked on Indiana Jones and SFX. Covering the art side is Astro Boy's Diego Jourdan.
This could be a cool story, the ghosts of Christmas aren't new territory for the Ghostbusters… but I think it could be done well, and a new Christmas-themed story is always a plus… don't know if Diego's art will be good as the samples on Google Images seem to vary… although if it's similar to his G.I.Joe stuff then it should be good.