please explain the feature (- multiple discussion boards per group) in 4.7 version ?

How is it going to be different from the current discussion forums features ? how is it going to work ?

If you could explain or give us the idea or picture of the new addition, how it is going to work in 4.7 then i will make sure to keep discussion forums of my 4.5 website in such a way that i can easily upgrade to 4.7 with minimum amount of work. And, i don't wanna customize the discussion forums in 4.5 if something similar is coming in 4.7.

Please advise.