Okay, so just speculation and rumor here. But it looks like Motorola could be releasing KitKat soon on their recent phones Trick or Treat
which means that the DROID Maxx, Mini, and Ultra get it.
With the new 4.4 update comes a workaround for Google Wallet to use NFC Tap and Pay Android 4.4 Feature: NFC Payments No Longer Require Secure Element, Use Emulation Workaround
I think that's pretty much the death knell for Isis. Personally, I say good riddance.