considering most gaia online users who started gaia in 2003 are way over 18 by now maybe its a way to split gaia users apart maybe 13 to 17's will use gaia and older 18+ will use the new site ,
I don't think they're really looking to divide the community.
With a place for mature content, they don't have to keep banning people.
...and I know a few of their artists do like to make naughty drawings.
So, it'd be more of an expansion of opportunities.