Hopefully, there will little interruption and hopefully it will all be over by morning and much faster and more fun.
UPDATE Alas, despite all my efforts to time the switch to occur during the wee hours of the morning the new DNS is still propagating through the system. Since any new posts will have to be imported to the new server I am waiting for the switch before publishing anything new. Additionally, the last server configurations have to wait until the DNS change is complete so there may be a few moments when MGx is unreachable.
Meanwhile watch this video about the largest grassroots movement on the planet