Copying and pasting the same thing I wrote about Tmo in a different thread, except it applies to Sprint as well.
All black and white will be available for Tmo on Aug 23. $199 on contract, but off contract pricing still unknown. Motomaker for Tmo in November.
Play store version sometime before the end of the year. No clear details on timing or pricing, except that it could be around $350-$400 range.
MotoX: Royal Blue/Orange/Black, Stock 4.4
Nexus 5: Stock 4.4
Nexus 7 (2013): ParanoidAndroid 3.99
(Previously owned: Nexus 4, GNex, SGS2)