Coming up in November at the end of the year is this two-parter by Mike Mignola and Scott Allie. In an interview with Mignolaversity Scott Allie announced A Cold Day in Hell which he's finished the first issue of. Earlier in the same interview he mentioned he had finalised colours and lettering on the first issue of a story coming out in November, so unless we're getting three issues of B.P.R.D. that month (unlikely), I think it's pretty safe to assume he was talking about the same story.
The artist was unnamed, but it was clear that it wasn't Tyler Crook since the artist had to draw this story well in advance in order to fit it into his schedule. Of the story Scott Allie only said this:
"...this two-parter, called A Cold Day in Hell, puts a piece on the table that is so significant that we can’t really say the stuff Tyler [Crook] draws is the main story because there are so many important things happening elsewhere."That's all for now.