I'm a early backer, but I can't play the game even now due to a huge network lag (700+ ping in China). I can't play with my friend, I can't play a single player game... sometimes I can't even connect to ubernet...(login screen forever...) I just want to know When can we host a Private/dedicated Server or host a LAN game or play offline?
The only answer I can give you at the moment is 'probably before the end of 2014'. Uber have hinted that we might get offline / LAN play at or near release, but nothing set in stone.
Well, release is on 5th of September. And they have declared that dedicated server will only be delivered later on - it has even been redacted from the feature list published by Nordic Games for now. Apparently, the server has still some major stability issues, isn't packaged yet for deployment, and who knows what else is wrong with that thing. Apart from the lack of a discovery protocol for games in the local network in the client and stuff like this.
PA client likely have LAN support before it's released for public. It's also work in non-developers environment in few versions, but for now it's disabled until game run with developer options enabled.