No worries, I really doubt servers will ever be divided.
As for updates, they are quite frequent and usually Dev's tell us about one or two days ahead, making annoucements fairly useless. They work in a constant flow, and stuff is implemented when it's done.
From personnal experience, I'm not to keen with annoucing updates as they have a tendency to be delayed when you do so and then create some disapointment among the community.
On the other hand, players are always happy to see some improvements when they join (apart from the potential download time

)