I've just used Vontre's simulator (really nice stuff) and for arcane specs it isn't good I must say, but maybe in the near future we'll have some of that fixed.
Also seems that wherever the word "Arcane" appears it irritates many "posters" so coming here to get info about anything that has arcane points in the build will end up being shooed away.
As Fandoth said the casting is very erratic on 40+ points in the arcane tree (it took me about 1 month to accommodate with the 30% meditation in 2.3) so it takes time if you want to get "the results" that the "different" people get. As I'm trying to see the dps and stuff I don't know if the Arcane Blast cycles can really be modeled since I get the same dps and dmg live as in the spreadsheet, even though it's not a patchwerk scenario standing still and dpsing 100% of the time and I'm casting more ABs than the cycle pointed by the spreadsheet

.
From what I've experimented the past week, I found out that a powerful mana regen tool that arcane has is magic absoption talent (since you will have at least 12k mana if 40+ points will be used in arcane). Only had tried it at Vashj but will do more this week. So it's a good talent because most hits that a mage will receive will be ranged magic hits, but that isn't the thing, the thing is that the magic dmg most bosses have is binary and +68 to all resists (without gimping dmg) together with the prismatic cloak talent (4% reduction) will get you to somewhere at 18% magic dmg reduction (I may be faulty in calculating +68 resist being 14% reduction) and that means you will fully resist 18% of the forked lightning hits from vashj (more if you'll be tanking the strider). I personally got from 3k to 9k mana in the vashj fights and I was never kiteing the strider.
At Al'ar I've experienced the same, that is many times resisting the 1 flame buffet he casts before the tank gets back near him after a flame quill, Void Reaver's Arcane Orbs (being hit by an orb is not viable, but pointed this just for reference), Solarian's Arcane Missiles and Light of the Astromancer.
Also from what I've seen the magic dmg received that isn't binary is in the range of 0-1.5k and the dmg that is higher than 1.5k is binary thus making that talent really nice for mana returns.
I don't know if is adequate to post here this kind of info but since it would be useful for mages, I thought this would be good. So if anyone knows more about this can confirm it since I've just recently really thought about that talent and how will it affect a mage (because of the nice mana returns I've started to look at lately), and also at this point don't know if you can collect this kind of information from WWS

.
EDIT:68 resist from magic absorption talent (10), improved mark of the wild (33), cloak enchant (7), mage armor (18).