Just dropping this here. Don't click if you had a hard time letting go of UO the last time. As an old custom shard addict, I got suckered right in and can't stop thinking of how awesome it's going to be.
http://shardsonline.com
It's also on kickstarter if you're into that kind of stuff: https://www.kickstarter.com/projects/1468280928/shards-online-play-by-your-rules