I wouldn't call that big though. The way I understood it was it was something big for the current fanbase. Shenmue would be big news amongst it's niche fanbase but that's about it.
I'm thinking maybe something from Epic (though I wouldn't call that surprising)
I think this E3 we're going to see Microsoft go after the core in the same way PS4 did last E3, and is still doing. In that respect Shenmue 3 would be a pretty big title, even people on Gaf who don't play the Shenmue games would probably consider Shenmue 3 being made as big/interesting news, though as you can probably tell from my avatar I may be being blinded by love.
From a selfish standpoint I hope it isn't as it would mean forking over £350 for an Xbone, and I think it has a better chance of success as multi platform game.