Valve released this on the 1st of April, so probably an April fools teaser.
Then on the 2nd:
Team Fortress 2 Blog wrote: The next class pack will focus on the Sniper. It's actually shaping up to be the largest TF2 update yet, with multiple new maps and a bunch of gameplay tweaks. In addition, we've got another update in the works that should be done before the Sniper, and that one will include some new content for all classes.
![[OFc] Member](./images/ranks/bullet_star_rank6d_4.gif "[OFc] Member")
