Is Paul McCartney playing some kind of April fools joke on his fans?

Today Paul McCartney has put a 5 second video clip on Facebook and Twitter which features a jumbled mash of unidentifiable audio.
 
There is a clear sound of McCartney's voice, however researchers have found no comparison to any of his previous songs after slowing the clip down and playing it backwards.
 
Have a listen for yourself:

 
Do you think it may be the release of a new track on the horizon?