You really need to get out more. The rumors, by device, with links:
Samsung Galaxy Note -
Cnet,
Phonedog,
Androidandme,
TheVerge,
this forum.
Samsung Galaxy S3 -
s4gru.com,
motoringcrunch,
iPhone 5 -
bgr,
Wall Street Journal,
pcmag,
Fox News,
endagadget.
Blackberry devices -
Techgod,
crackberry.
My take:
Samsung - Sprint did really well with the first two Samsung Galaxy phones and the Samsung Galaxy S2 was one of their flagship Android phones. It doesn't seem likely that they would abandon the line with such a successful history.
Apple - Sprint has committed to spending $20 billion on iPhones. To put that in perspective the high estimates for the cost of their LTE network upgrade are less than half that. In Q4, 40% of the phones Sprint sold were iPhones. It seems unlikely that Apple wouldn't reward Sprint for their commitment or that Sprint would abandon the iPhone.
Blackberry - This is the least likely because Blackberry is losing marketshare rapidly, Sprint has already cancelled their order for the Playbook 2.0, and Sprint's new target market is college students. RIM may not even survive 2012. Still, there are a lot of people who MUST have a Blackberry for one reason or another and Sprint has stocked Blackberry devices for a long time. A lot of Motorola's new phones seem to be designed to, "convert" Blackberry owners with a similar, "candybar with a keyboard" form factor and an, "Android for business" configuration. Sprint will probably cut back on Blackberry to make more room for Motorola but not drop Blackberry completely.