it is possible to use postwork via Photoshop for an anim!! as the overlays are just replacing the cell-sheets from "old-skool" anim, so special effects like lens flairing sword blades or alternating the sparkle off some gemstones, is easy to do as a postworked overlay.

having seen some of the lastest Japanese anime i think they are still hand-drawing most of it, and can see the possibility there that they could of used Photoshop for overlaying special effects, like magic trails an stuff, i could actually believe that the whole thing can be done in photoshop really, i'd guess though that the hand drawn stuff is still taking about five years to complete.