It's now got an updated description, but initially, it said:

Vague enough to raise uncertainty, as evidenced by the comments that followed:

The two deejays who posted the image, Gerald Koh and Joakim Gomez, did make attempts at proving the veracity of their picture:

They also updated their post description to include what you see above:

Update: It's real guys. Not photoshop or an elaborate Christmas prank. Look out for McDonald's update real soon. They have a Christmas seasonal menu for you.

This is something you got to try at least once!

Thursday morning dawned with a flurry of McDonald's fans verifying this very exciting-sounding picture, though:

And in case you think we only relied on one source, here's the one from the horse's mouth: