Over at xda-developers there's rumblings of an HTC Knight headed to Sprint. There's even a generic, somewhat doctored-looking pic, which is always perfect fodder for the ol' rumour mill.
The xda-developers source claims this slider phone boasts a 3.7 inch screen (same as Nexus One), looks like an evo and has the same USB micro port. Here's the telling bit of XML data that kicked this all off:
3. Make sure to activate your device before you operate the handset by setting up the Google account on the device. 4. To view the contacts on the device, select "Contacts" and push "Menu" button, select "Display group > All contacts > OK". 5. Do not slide screen in/out during the operation.