Gaming know it all Geoff Keighley has tweeted that his team at GTTV has just finished an E3 spot for a top-secret game that no-one is expecting.

Keighley tweeted:

Today we filmed a huge top secret game reveal for our E3 coverage. Can’t wait to share it with you – no one will see this one coming.

This could literally be anything so we’ll let you guys guess and speculate. Our guess is that it’s Half-Life 9: Episode 6. Probably.