When a very talented developer says they plan to unveil something new at E3, everyone pays attention.
Platinum Games tells IGN that they've got a currently unannounced title that will make its debut at E3 this month.
They clarified that it is not the Xbox One exclusive Scalebound and that whatever it is, we've never seen it before. Platinum has made Metal Gear Rising , Vanquish , and the Bayonetta games in the past; they specialize in high-octane, wonderfully polished action extravaganzas with a very distinct flair.
Also, don't forget that they don't often do sequels; they tend to prefer new IPs. So when the announcement arrives, don't be surprised if it's not Vanquish 2 (as much as we'd all love to see that).