Sprint is hooking up with Clearwire, Comcast is hooking up with Clearwire, with roaming agreements on the sprint evdo network.
Is comcast eyeing sprint as a prize?
That's my take as well, although it may take years for it to happen, and it's been a regular rumor for years now. Sprint clearly has problems, there are some clear advantages to a tie up that allows both to better compete against AT&T and Verizon.
For Sprint/Clearwire: A return to fixed lines Residential / Small-Medium Business Financial resources
For Comcast: National Wireless Network (~50 million customers) Big Enterprise / Government customers (a who's who list of high value customers) SprintLink Tier 1 backbone (at cost bandwidth, although bandwidth is cheap) Global Presence