One of the things I am particulary excited about is the new fleet tools. My favorite part is the ability to post fleets in a manner similar to corporate contracts. This is going to make ad-hoc activity of all kinds much easier and I am really excited about the possibility of just joining up a fleet in progress such as a Mendolus roam or one of the Alliance fleets. If taken full advatage of this feature will get rid of a good chunk of the "any fleets?" or "x up for fleet" chatter. Taking something that we have to handle manually and informally in chat and placing into a new interface is a great step forward for fleets. Of course I am also excited to use this for pick up mining operations.
You can find the full details here: Now Where Did I Put That Fleet?
Obviously this is a small part of a pretty major upgrade, but I don't really feel qaulified to discuss Sovereignty in a very detailed manner.
I am looking forward to the update though, as I sure many people are.
Patch Day: Be sure to set long skills to training people!