No, not... really. There have been demos and videos already for DNF, it's quite far into the announcement.
The DNF Gearbox has and the DNF that existed before they picked it up are two different beasts. They're technically the same game, but Gearbox has polished it
immensely. A full preview of Gearbox's DNF has not happened yet, and really, any preview or video of it before Gearbox picked it up doesn't really count anymore.
And I'm not sure people would be 'begging' for that cover, if the game's already been set up. I'm not buying that it's DNF in February, but seeing as the first preview for the cover is in a couple of weeks, I wouldn't say it's TES either, as they'll probably announce it themselves (possibly with a countdown) before the preview.
The January cover is out of the question, but the February cover, that will be shown in early January, is perfectly reasonable. Surely you don't think they need an entire month before the cover reveal to announce it?