A teaser image for an upcoming announcement from the world of Angry Birds has been posted on the game's Facebook page.

What do we know about this teaser? Well other than the fact that "they're coming", not much else.

For a franchise that has conquered phones and invaded most household goods, this really could be anything.

Pocket Gamer's boffins speculate that this could be the arrival of extra levels for the existing versions or even a whole new entry in the Angry Birds series (as mentioned by Rovio in the past).

It might even be the first glimpse of the upcoming Angry Birds movie confirmed last year.

We'll keep our eyes out in case any further details emerge.