new experimental builds are generally coming out multiple times a day, ive found 90% of them to be stable as well.
Official release is due out soonish.
I wouldnt mind some very, very, very rare jokey zombies though. Like 1/10th as common as hulks are? So you would see one every 3 or so 3000 kill games? Nothing wrong with a bit of a chuckle every 30 hours or so? Not beavis and butthead so much as zombie bill murray, the fallout idea or even just some of the devs or something.