Little bits of Harlequin information are still out there, as more and more people this week have access to the White Dwarf. It looks very possible that we will see a codex next week.
This sounds like he is reading parts of the next White Dwarf, but I was not 100% positive. Thought I would relay the information, as it seems it was being ignored for the most part. Take it as a rumor until we get more information.
via Neckutter on Warseer
On sale February 14th, "Harlequin Masques" are for sale along with harlequin heraldry. Sounds like the codex is for sale on that day, and the painting guide as well. Harlequin Masques are what the army is referred to.