The return of bases has been mentioned. If we have demorecords of our bases, does this mean we'll be able to eventually import our work?
Yes, if and when we do base stuff, import from demorecord is both a must have feature and relatively easy to do.
What about Supergroups and Coalitions? Will we be able to establish an SG?
Not at release. It is on the roadmap, though. Supergroups require more server-side persistence than we're currently doing, but I have some ideas for how to implement it as a private MUC room and using the XMPP publish-subscribe extension to store persistent data in it.
Will Collision detection exist?
Yes, full collision detection between players works. Currently there can sometimes be a little bit of jitter since you have multiple clients and no authoritative server to resolve them, but we hope to improve and refine player movement incrementally with each release.
Will multi-client connections be supported? For example if I want to RP as three werewolves attacking a character, will that be a possibility using the same Titan account?
XMPP inherently supports multiple logins on the same account. It would take a beefy machine to handle it, but there's nothing preventing you from running 3 copies of Paragon Chat and loading up 3 different characters at once.
Will there be the original CoH music playing in the background ?
It's whatever is in Issue 24. We're not doing any client mods at this time, though you could drop one in yourself to override the music if you want.