Doubt their engine is capable of much higher than what they're already doing over on AL unless they do a major overhaul/update their game engine or just USE UNREAL ENIGINE...sheesh...

No SSS (sub surface scattering: opaque or sort of like transparent but not quite...like the light that passes through ears or skin on your hand, no AO (ambient occlusion: realistic darkness around objects like in other bigger titles sort of like shadows but different), higher resolution textures, static shadows, higher polygons counts, and certainty no real time rendering going on at all.

If they did even one of these the game would require a much more beefier device than what id say 95% of their user base even has. So...no. they wont update the graphics much more than what youll see over on arcane legends.