Android and UMA?

I found this Android wish list and people out there want it to include UMA in future programming.  (This is the ability to make calls over wifi.)

http://code.google.com/p/android/issues/detail?id=6242

Sign in and star the conversation to bump it in priority.

I'm not an expert on it, but it is my understanding that there is also a hardware component that must be installed, but here is to hoping google can get it implemented.