Maybe the last army, will be darkoath?
If dwabringers V will be chaos, maybe it comes with lady of ruin and some khorne heroes, but first, a box with new marauders and marauders horseman, some "heavy" infanty or small monsters, and other heroe for darkoaths.
And what you are talking about the next edition of warcry will be focused on cities, Is it speculation or are there rumors?