TrueNetLooks like TrueNet was already listed as a partner, but the pair made it official with a release today: http://www.digitaljournal.com/pr/1861354. Not much additional detail on the network tech though.
Why a new network?I'm not sure I see the need for a separate M2M network. The point of M2M, and the reason operators are so interested, is that most devices use very little data, so it doesn't tax the network. It's only upside in additional revenue for them. If the connections become too much, it could harm the consumer experience, but is there a real concern that will happen?