The three devices are the MiFi 500 LTE by Novatel Wireless, NETGEAR Zing Mobile Hotspot and NETGEAR 341U USB Modem. Sprint is especially proud of the fact that these will be its first tri-band 4G LTE devices, meaning that they will be able to connect to the three LTE bands that happen to be within reach of the nation's third-largest carrier: 800 MHz, 1.9 GHz and 2.5 GHz.
According to Sprint, such kind of advanced connectivity will make the LTE experience with these devices significantly better, with noticeably stronger in-building coverage.
Now the only problem that seems to remain between Sprint and world domination is the LTE network's spotty coverage. That's something that Sprint doesn't have an answer for right now, but here's a map if you'd like to check whether you are among the few lucky ones.