My money is on them eating the entire regions of Aridian and Capilaria with minor breaches in Aspiria. This would put the threat directly on the doorstep of Hallowheart, Brightspear, Lumnos, Hammerhal Aqsha, and Har Kuron, and would make them a threat to the Idoneth (Fuethan Enclave), Fyreslayers, and the ongoing efforts of the Crematorians to covertly gather information from Lumnos about their Balefire problem. This sets up 2nd waves for the DoK, Fyreslayers, Idoneth, and OBR as they rise to meet this new threat, and maybe CoS if GW feels like it. The Kharadron could receive theirs coinciding with whatever happens in Ghyran.