New skins awaiting to be released
After the patch #23 release dataminers have discovered a new set of skins that is expected to be released this month. Tracks of zombie bots,StatTrak weapons from Counter-Strike: Global Offensive and plenty other stuff has been discovered in the game files.
Other skins could be found in this album.
No ETA of the skin release has been yet revealed, but surely we won't have to wait a lot before we would be able to accumulate the Halloween skins.