Essentially, this update seems intend to reroll all the mesmers past nerfs. Mantra of Recovery is back, Ineptitude, Clumsiness, Crippling Anguish, Migraine, Mantra of Persistence, Shatter Enchantment, Spiritual Pain and Enchanter's Conundrum. To make the row of incredible spike skills complete, Energy Surge is at a new all time high. Furthermore, random skills had their damage buffed, and attempts are made to bring back e-denial, resulting in just bringing back 123BOOMSPIKE. Which is now AoE across the board.
Really, these Mesmer buffs are almost all PvE only. None of the above buffs were called for - most can be returned and the game would be better off for it. AoE seems almost omnipresent, and the much coveted KD is freely handed around.
There's a few interesting tests, Panic, Instability, Aneurysm, Tease, Arcane Conundrum and Calculated Risk all add some cool new toys and with some tweaks some other things could stay too (remove the dmg clause from wrack, lower complicate's disablement numbers, disruption sig's recharge redux is good).
Anyway, these two points in the dev commentary had me laughing:
To use Illusionary Weaponry properly, a Mesmer must wade into melee combat, but the high damage output from Hard Mode creatures makes this impractical. We've added an armor bonus to this skill in PvE to address that. To keep things balanced in casual PvP formats where enchantment stripping is limited, we've split this skill and kept its original behavior in PvP.
Wait, the most +AL a mes could get out of this is +40, putting their total at 100AL, the same as a Warrior with Sentinel's insignia. In that case the mesmer can't use an IAS and has a dreaded DPS of... 28. Clearly, such an all powerful buff as this would unnerve every dedicated Gladiator and thankfully, this horrendous buff has been kept out of RA.
We added a Weakness component to Signet of Weariness in order to give it more use in PvE, where Energy denial is less effective.
So you added Weakness, an anti melee condition, to a signet, which has an anticaster effect, an effect which is useless in PvE, on a skill which has too long a recharge and activation time? That sounds like the best. Idea. Ever.