I see a lot of people talking about how Nomura and SE won't say anything about when Unchained might drop, but we all must remember they have a deal with Disney and have to follow their directions. There is a deal between the two companies and both sides have to follow the rules that have been put in place by the other side. I think if this theory doesn't pan out (which I hope it does and seems very reasonable) they may just have to wait till E3. Please don't lose faith because SE is really trying to make the best series they can with what they have to work with.
And SE didn't really hype the Unchained drop in Japan, just sent out a tweet a few weeks before it actually released and that was about it.