GitHub and RTC, together?

Hello all,
I am investigating both RTC and GitHub for potential use in our environment SCM tooling.

It appears we will indeed be rolling out RTC for a large portion of our users - some are already using it's planning, tasking etc features.  But as far as source code management - and in particular, code review capabilities, I am looking at GitHub as well to see in what capacity it can also be leveraged.

One of the teams has previously used GitHub and it's code reviewing features - and we understand from IBM that RTC does not provide similar functionality (in code commenting and collaborating etc).. so one scenario I'm looking into- is it possible to use GitHub for both code management and review, but integrate/link it to RTC's planning/tasking functionality?  Or, use RTC for above purposes in addition to code management, but somehow link (change sets?) to GitHub to tie into it's code reviewing features.

Any ideas, or general thoughts/comments/info on GitHub/RTC integration is appreciated (noting I mean GitHUB in particular, not just Git itself :) ).

thanks,
Paul