I'm pretty sure he meant premium as in "paid for" not as any comment on the quality of your mobile theme.
I also think doing a premium (as in PAID FOR, Ya gotta buy it) mobile theme is more than pointless, as Kier and Mike have one in development which will be officially supported and no doubt be fabulous, like everything these guys do.
Not to take anything away from Russ, who jumped in and made a brilliant mobile theme to help out the community.
As a mobile theme is more functionality than anything, I think it is best left to the software developers to produce the best mobile theme, in the meantime you have a great offering now.