If they were just moving servers I would think the entire site would be down and not just the forum. Plus Steve probably would have said something.
So short sited...
When you move servers you leave the old site up, but closed, while the DNS resolves...The old site is closed so no one can access it, and the new site is open so when DNS resolves for you, you get the new site...No one ever gets a 404 or a server not found. It's called good planning.
Any upgrade and/or release is welcome, great if you get it. I'm just repeating the reason for closing as I recall it and it said to move, not release a gamma.
When you move servers you leave the old site up, but closed, while the DNS resolves...The old site is closed so no one can access it, and the new site is open so when DNS resolves for you, you get the new site...No one ever gets a 404 or a server not found. It's called good planning.
Actually there's a couple of misconceptions.
First, what is happening today has nothing to do with the server move. That is scheduled for tomorrow.
Second, the server move is a physical relocation of the server itself - not a transfer of data from one server to another. The hosting company is moving their servers to a new facility. Consequently there is no 'old site' to provide DNS from.