Nope, a 3D phone really isn't what Sprint has up its sleeves (despite the speculation) - though the device it plans to unveil later today will, apparently, feature some amazing screen tech.
This morning, the Wall Street Journal reported that Sprint's big announcement will involve a Kyocera-manufactured device called the "Echo," which features two 3.5-inch displays connected by a "pivot hinge." To be honest, I had a hard time believing the rumor - it sounded like the stuff of dreams (at least with the current state of technology) - but it looks like my fears were unfounded, for a search for "echo" on Sprint's site brings up the following result:
While the link below the promising text doesn't open an actual product page, it does lead to the following gem, which makes the possibility of an official unveiling tonight even more likely:
Guess we now know why Sprint didn't have anything to show off at CES (excluding the Shift 4G), eh?
Sources: Sprint, WSJ via Engadget