No hard facts are known about this upcoming handset, but rumours are going wild that it's set to be part of Sprint's line-up. If this is true, and it's indeed running WP7, then this is set to be one of the first CDMA handsets powered by Microsoft's latest mobile OS.
There is no point in speculating whether a WP7 handset is going to be Sprint's "industry first" or not, especially as we will know for sure on February 7.
As for the other phone - the Kyocera Echo - details are even scarcer, and all we know at this point is its internal codename, which is said to be the "Sanyo Orange", and that it's also going to Sprint.
source: UMTSO via Engadget