We could be in for a large jump in dps, and assuming that increases, endurance and other stats also.
This is purely theorycrafting but take a look at this picture taken from the mage soul unveil live stream:
This damage relates to a skill currently on live, combust.
On live this ability did 614 damge over 8 seconds at 2173 SP.
Elrar's char has it at 2218 over 8 seconds, which is over 3 and half times the damage, and such spell power.
Either the new passives in souls trees greatly increase spell power, or the gear he was wearing (assuming it was level 60 raid tier) has a huge increase in stats over current 50 raid gear. Either way, I don't know what to think if the increase is really going to be that great each expansion, I mean look what happened to that other game.
I hope to god that Elrar was just using lolgm stats, but I don't see why he would of since he has the instant kill gm codes if they are needed for the stream.
What are your opinions on this?
EDIT: also just noticed, 412 mana for an instant cast shows the mana pool, and regen must be a lot higher also.