I had seen around different sites that "gamercard' you mention will only be viewable in Home- it won't be available to use as a sig or whatever around the web.
We should be hearing a definite date on Home soon- the Tokyo Game Show is on from Sept. 20 to Sept. 23. I can see Sony announcing a date during that.
To be honest, I haven't really been following many of the updates regarding this other than the rumored date that got bandied about (and shot down by Sony). Not being in the beta myself makes it harder to say what i would like, don't like, etc.