Well, here we are debating is it going to happen, when is it going to happen... All from one little tweet. Point being, things get blown out of proportion. If he'd have said "I've just read the new script for red dwarf" people would have taken that as absolute official word. Whereas, although it's probably 90% likely as far as the writers, producers, cast are concerned. They couldn't officially say that's the case until the distributor confirms that 100% this is signed and sealed. However in my opinion with the cast leaving clues I'd say it's more than likely to happen. I'd also think that expecting a new series next year would be pushing it. I'd expect it more likely for 2015, which I'd personally consider to be a fair expectation.