It looks like some of the factions (what I'll call "vassals" of either Chaos or LLJK) are being attacked. Turks are attacking north of their main base, and Hospitallers are also doing the same.
Just my observations from looking at the battle page, I'm assuming Chaos and/or LLJK are going to try and squash the aggressive expansion into what is either their vassal's territory, or factions that they have allowed to exist. Or at minimum protect their claims from being infringed upon (by using armies as a deterrent or force).
Finally some interesting stuff happening in NA, but my assumption is that Chaos won't get too involved because there's always the threat of the EU crossing over into NA lands.
Also interesting to see the Nordmen attacking (and taking) some DRZ lands just south of Chaos territory in the EU zone (tosdhar and ushkuru). Looks like lots of action is gearing up.