Sprint has moved forward with their plans to end 2-year contract plans on smartphones. An internal document was leaked which details the Now Network's plans to join the rest of the US carrier industry in eliminating contract subsidized plans. Sprint actually announced their plans to do this back in August of last year, but they are just now finalizing their process to make it happen. Apparently, this new end to 2-year contracts on Sprint will only apply to phones. Customers will still be able to get tablets on Sprint's network with a subsidized plan.
Reflecting on the final death throes of the 2-year subsidized contract, that's all of the big carriers in the US now. T-Mobile started the ball rolling, Verizon later joined in, Sprint announced after that but is only just now following through, while AT&T ended up last to the "announcement" party.
Source: AndroidCentral