The Walking Dead add-on titled 400 Days has been spotted on the Steam database, suggesting this is what Telltale has been teasing all week.

So far the studio has released Vine Tweets titled Day 2, Day 220 and Day 236, presumably building to the Day 400 reveal.

We're assuming 400 Days is the "little something extra" Telltale has promised before the planned autumn launch of Season Two.

Expect an announcement shortly.

Source: IGN