Hi, Expanse is exiting because its got all the good stuff from Ethereum and is actively being work on with regards to the DAO, ICO's with TokenLab and the Byzantium fork happening soon bringing lots of improvements.

A good place to start is to have a look at the latest blog posts:
http://blog.expanse.tech/

Then chat with the rest of the community:
http://slack.expanse.tech/
https://twitter.com/ExpanseOfficial
https://www.reddit.com/r/ExpanseOfficial/

To get involved with the development:
https://github.com/expanse-org/go-expanse

Block Explorer:
http://www.gander.tech/