IMHO these new bundles might actually have a negative impact for Linux gamers.
I guess the majority of Indie developers rather decide to go for
"Indie Royal Whatever Bundles" if they're not required to provide Linux versions.
Even with Linux users willing to pay more than Windows users, at least for the
Humble Bundles so far, bear in mind the total share of the generated money
is rather low compared to the Windows and Mac sales.
So unless an indie developer is a Linux enthusiast, where I fail to see a general
correlation, I wouldn't be suprised if we see less indie developers to opt for the
Humble Bundle "way".