Looks like there is a WiMAX mobile handset from HTC on its way to Sprint according to a leaked Sprint inventory found by the guys over on phone arena, and is the HTC A9292 which is an Android powered WiMAX candy-bar.
Other than that not a lot is know on the HTC A9292 just yet, but second on the Sprint inventory list is the LG LS680 which will apparently be an Android handset similar to the LG GW620 Eve.
The Sprint list also reveals the LG LN510 which is said to pack both touch screen and QWERTY keyboard, the LG LN240 and LG LS680 and the Palm C40 is there also and again not much is known of this handset.
Sprint also gains the BlackBerry Tour 2 9650 which is rumoured to pack WiFi and a couple of Samsung phones in the form of the Samsung M350, Samsung M570 and Samsung M910.