HPal pvp mana regen went from 5000/mp5 before the patch to 2000/mp5 now. Baseline mana regen outside of PvP is 10,000/mp5…
…so either this is wrong and it should read 80% less Mana in PvP combat (was 50%), or the mana was over-nerfed.
You can get by with Blessing of Winter and Divine Toll+Daybreak on cooldown, plus free FoL’s from infusions, but this forces us to take very specific top-end talents and adopt a passive playstyle just to not oom extremely fast.