I have heard zilch from other delegates or anywhere else that a new version of code is being rolled out today.
So my best guess is it will take place gradually. I also tend to agree with DSN that we'll not see any roll out of DPoS 2.0 very quickly, for most of the same reasons.
What will the deployment look like? Aside from it not happening quickly (which is probably a good thing, as it gives the community time to discuss the changes before they are thrown into the wild) it also leads me to believe all this build up without a hint about hard forks or a plan for delegates to update their nodes, is part of a comprehensive marketing drive, and that will be the primary delivery today, plus perhaps the work that's gone into press releases and documentation of various types.
Right now BitShares software is at version 0.9.2. What will version 1.0 contain and when will it be available to the delegates and community at large? Will 1.0 be radically different requiring all to upgrade or backwards compatible with 0.9.2 to allow for a gradual changeover?
Soon we will find out. IMO it will be a gradual change taking place not in a day like today but rather much longer. How much longer? I believe that will be answered today.