You can connect to multiple machines now. The beta only supports US keyboards (although you might find that non-US ones work, we just haven't thoroughly tested that scenario yet).
Thanks, but I would have thought this should be core to the design requirements. The \ character is essential in Windows, yet using the UK keyboard layout for a Mac it is impossible to generate it in an RDC session under the current version. It means you have to remember to flip the Mac onto US keyboard layout before you begin your RDC session, and if you forget you have to close your running Windows programs, log out, restart the RDC program if it's still running (because otherwise it just hangs when you try to reconnect), change the keyboard layout, then reinitiate the session. It's the sort of jumping through hoops to make software work nonsense that should have been eradicated in early testing, and leaves the impression that yourselves at the MacBU didn't consider non-US Mac users at any point.
Anyway, rant over. I'll await judgement on the beta until I have time to properly test it.