It is coming out today, telltale confirmed that.
I think it depends on your timezone now. It's a little past midnight here, so technically it's today for me.
Its Afternoon here, So Its midnight for me?
Maybe or probably a few hours from now
I'm not sure, as they haven't stated what exact time they're going to release it (at least to my knowledge). Sorry! Most people think it'll come out after or during the new 'Playing Dead' episode, so maybe it will be around 12pm my/Telltale's time.
The trailer is going to be showed in new playing dead episode I think. Go to telltales twitter, there is tweet from the guy who is interviewing Scott porter in that episode. He tweeted that there is going to be "debut of the new trailer".