According to the flyer the device will be available for new subscribers and upgrades on March 23. The price is unknown, but T-mobile’s flyer describes the Jet 2.0 4G as targeting the busy, value-conscious user. That would lead you to think this will be a cheap offering.
Features of the USB modem include a microSD card slot presumably allowing it to act as a flash drive and WiFi connected management. The Jet 2.0 4G will require a webConnect Data Rate Plan.