I was thinking about this before, if a third 5th Gen Pokemon game is announced how will they work around Black City and White Forest?
It wouldn't really work to have both in (where would they go?), but you couldn't just use one either (the third game is suppose to include everything+extras), so your left with the the option of having somewhere new, but that ends up making it just the same as the first two rather than a complete/extended version of the originals.
So what do you think, will they put White Forest to the outskirts of Black City, just add one of the areas, remove them both and add somewhere new, or have GameFreak/Nintendo blocked themselves out of been able to make a third game?