Could this be used to collaborate on WordPress Core? I'm interested in start doing that but the setup process (installing VVV, Vagrant, VirtualBox, etc.) is a little cumbersome.
Yes, it could be used, we are working on git integration so you can push to git from the IDE. WPide takes care of launching instances, each one starts in it's own VM with everything it needs installed.
I am wondering other items like integration to Github or how to deployment to a wordpress site etc. I can't see these items on their landing page. Any ideas?
Right now you can export or download site+database. We have git integration and deployment via FTP/SFTP on the list.