My artist and I are currently working on the Nailgun! This will be the first heavy weapon that makes it into the game. If nothing stops us, we will have it ready for you within a week. It has two fire modes, one shoots heavy nails and the other shoots a grenade that explodes into... more nails :)
Besides that, I've updated the game yesterday. I've added a new Death Cam, which is a fancy term for spectator mode after you're dead. This feature was commonly requested and I hope you like it :)
To read the full changelog of yesterdays patch, go here: http://steamcommunity.com/app/321270/discussions/0/364042262881284708/