The two way functionality on this at the time of release is primarily the same stuff as the MX6000. It's got two way on the iPod, using the PSX1 dock, as well as iTunes and Media Center via the Autonomic modules, as well as the standard internet stuff, like weather, and stock tickers. It also currently has a few other features that are being worked out that should be available on release that will rely on feedback via the RS232 ports and will work with the existing MSC400's.

The MSC-500 is what the MSC-400 was originally, only it had cat5 ports on the back to support single-gang inwall keypads (essentially a 900 in-wall) which were scrapped. It's not likely that we'll ever see a product called the MSC 500 come to market.