The media -- yours truly included -- has been trying to figure out why Sprint has booked an insane two-and-a-half hour slot at CTIA later this month. That's not the kind of event you throw together just to rehash the devices you've introduced over the last half year -- something's up, and if our source is correct, they're up to something big.First, we're hearing that the carrier will launch the Nexus S 4G from Samsung, and judging from the name, the phone should be something akin to a Nexus S with WiMAX. It seems this one could be either the SPH-D600 or SPH-D720, both of which have recently received certification from the Wi-Fi Alliance, though the SPH-D720 is more likely; the D600 shows WPS support, which is available in TouchWiz-skinned devices but not in stock Gingerbread . You might recall that Sprint came very, very close to launching its own version of the Nexus One before dropping it in favor of the EVO 4G last year, so maybe they're ready to do the deed this time.Next, a couple that we don't have much detail on: the EVO 3D, which is... well, a 3D-capable EVO of some sort. 2011 is certainly shaping up to be the year of 3D phones and tablets , so that wouldn't be much of a surprise. The other unit in the mix is the EVO View, a tablet that we're guessing will shape up to be something of a CDMA-powered Flyer . If this all pans out, it's looking like Sprint could own this show. CES was a bit of a dud for them, you might recall -- the EVO Shift 4G was the only handset announcement there -- so they're overdue.[Thanks, anonymous tipster]