The Test Server has been updated with with the Halloween event content, you will see zombies wearing the pumpkin mask shown below, killing these zombies will give a chance to obtain a permanent item skin of that mask. There is also a scarecrow mask skin that can be found inside Battle Royale airdrop crates.

The main game should be getting these updates later today.

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Sebastian Strzalkowski (Art Director) also posted some previews of new art assets via Twitter.

Working on more props for the streets in-progress #h1z1dev @H1Z1game pic.twitter.com/bxfZDwAGjO

— Sebastian (@crowempires) October 27, 2015

click for high resolution images