Yes. If it needs to reroute, it will do so as long as the "terminating" site doesn't go offline. That's the one maintaining the "final" TCP stream so that one can't be rerouted.

Multicast support has been discussed, but it's not at the top of the pile of features that are getting worked at this time that I know of. I'm sort of on the other end, closer to the SDKs than the fabric, but I am pretty sure it's not in the immediate priority list as I recall.