Let me tell you something...
I've been in the shoes of those developers, working so hard to revive our favorite game. Kinda.
Whenever you feel so close to solving a problem, at least 3 more emerge. Re-writing a server-side client in another language, while it seems doable is not an easy task. Those estimates are unreal. It is just not doable in the spans mentioned, If those guys manage to do that- I'll applaud them. I do not want to break the hype, but the winter release will be followed by the spring one. If it was meant to be done it should happen over an year span.
I actually don't believe that those devs are able to pull this stuff. So young and lacking experience... They are giving us false hopes. I predict that nothing will be playable, except the forge in the next 2 years. I know how those things work and this is just a masquerade. I am grateful for the effort put into it, but I just believe that we'll get what is promised in the days to come.