I haven't looked at it too much, but it looks like quite a few new features were added. There's rengo support now, a goban editor, something called shape-game, something called zen-go...

Looks interesting

Yeah, this is an amazing upgrade.

Shape games are basically starting a new game from a preset position, so you can practice a certain opening, re-try a certain fight, etc. It's neat -- I've already set up 2 waiting room games with the Shusaku Fuseki

_________________
The road to wisdom? Well, it's plain, and simple to express: Err, and err, and err again; but less, and less, and less!

The upgrade is nice. It is unfortunate, anyway, that new ruleset (I'm thinking about AGA) were implemented.
I guess superko is difficult for DGS?
Anyway, nice work

This seems to go well with the bidding komi that they added: you could put up a potentially uneven situation and let each player bid on which side they'd prefer!

Direct link for seeing all the many changes:

http://www.dragongoserver.net/news.php#DGS_1_0_15

Many new features!