Hey @CryptoTask, @dimitar.chain was asked about multi-party channels during an AMA some time ago - here’s his answer:
#5 - Will state channel support multi-party channels? If so, when will it happen?
Multiparty channels are a hot subject. I personally am against them as so far I haven’t seen a solution that cannot be easily attacked in theory. They end up either centralized and trustful or broken by design. I hope we can offer an alternative using virtual channels.
He’ll complete me if there are any updates on the topic 
Best,
Albena