Has anyone considered that TN just doesn't like tengu? not trying to fan a flame, but it might explain a lot...
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Kodachi is right, Tengu is coming and the picture and the messages of yesterday are the evidence of it. I don't want repeat this like a broken disc but people, the phylosophy of TN is pretty clear: when you ask for something that will not be included in the game, they don't say nothing on the argument, with a silence that talk for itself. When they recognize something.... then you can be sure that they have already planned to take an action related to that content.
In the past they answered to a fan asking for Kasumi's ragnarok outfit available on Xbox, to another asking for old outfits for male characters, to another one asking for a contest for choosing an outfit voted from the fans... and after a period more or less long, all these ideas ended to be realized. It's this the reason because I get in high consideration every little hints that they give, because are always confirmations for things already setted from them: this is one of the reasons because when they say
"If fans will ask for more legacy outfits they will be released", or
"If fans will ask for Phase-4, she will be released sooner", I think that they are only playing (in an innocent way) with the fans, because actually they have already decided to make happen both the things

In no way "begs" are involved.
If Team Ninja publicly recognized the wish of the fans for getting Tengu through their social networks (and not only yesterday, but also in 2 recent past occurrences), having to base my judgement on the past experience the most likely answer (not possible, but just the most likely) is that Tengu is for returning.
Of course I can't have the certainty like anyone of anything, but the chances appear to be really from his side this time.