Dark Reaper Exarches are not the worst, imagine an army of Dire Avenger Exarches with direswords.
I thing the understrength units will be houseruled.
About the poxwalkers and necrons, now we know the plot for how the necrontyr will regain their physical form, I wonder if Ynnead may manage to free Isha from Papa Nurgle which then leads to Papa Nurgle striking a deal with the C'tan?
My friends Primarines + Acolytes army, was just nerfed, now when the Acolytes are not cheap cannon fodder anymore.
Watch out for Swooping hawks deep striking after turn 3 now.
Shooty psychic powers can be lethal to characters, too bad eldar lost all their shooty powers