It would be up to them. I posted the below question on their thread. I hate to be pessimistic, but on this - my personal expectation is that they will probably end up doing their own thing and going their own way. Let's hope I'm wrong :)

Hi Golos team (@vitaly-lvov, @pioner, @litvintech, @misha, @hipster, @creat0r. + @val and @marina in the background) - I have a few questions about your project.

• Do you plan to use the Steemit.com code as your starting point for the front-end UI, or will you be creating a new interface from scratch?
• Do you plan to keep the functionality of your blockchain and front-end website in synch with the Steem/Steemit code?
• Do you plan to submit any updates you make to your version of the code (other than the Russion language parts) as pull requests to the Steem/Steemit code base?