I got an "Error: application already exists". Then I opened up the market app manually and it shows that google wallet is "downloading" in the my apps page. However, it's been going for a while, so I don't think it's going to install. I already installed a version (1.1-R48v4) from xda, that I think may already be this update.
I click "x stop 1" to stop the google wallet download but it doesn't do anything, still appears to be downloading.
So I killed the market app in the app manager, and then reopened it and google wallet is listed under my apps. Not sure if it was there before (maybe the updated xda version was recognized by market). But I guess its there... now just wanna test it out!