Speaking with a tech while trying to trouble shoot an issue they seemed to indicate that the web-based PVR control was "in testing" with a consumer roll-out possibily occuring in the spring.
In terms of security, MTS Internet side is basically converted over to a Microsoft Live service so why not use a Microsoft Live account for security, ideally the same one as your Intenet if the customer has both.
In terms of wireless devices, I think MTS should look at which type of devices it offers and focus on those. Currently that would be Blackberries and Windows Mobile. Microsoft also has some history of making clients for the iPhone, although not specifically for MediaRoom.
In terms of other features, I think there are three MTS needs to tackle sooner than later as they were offered on the Classic service. Those three are, one screen call display, color coding the guide based on content type, and allowing a box to auto-tune a channel at a specific time.