I didn't watch the stream but this image has been doing the rounds this morning.
You can watch the reveal at 2:46:35 here: http://www.twitch.tv/tgslive/b/618340425
https://mobile.twitter.com/Kojima_Pro_Live/status/562089427380342785
We'd like to say thank you to the fans for their enthusiasm but to clarify we did not tease a new game at the Taipei Game Show