I am aware that we're talking about rumors, predictions and leaks. But basing on that...
Disappointed by lack of dervish/para love. Fixing scythe and buffing Mysticism a little bit ain't THAT hard and time-consuming (tying more things to Mysticism would do enough good) and it would help the dervish community a lot. Just to repeat what i told a lot times earlier regarding skill updates: people don't expect updating 20 skills + changing an attribute + changing a weapon at once; it would be MUCH better to see 3-4 skills updated, but more frequent. That way the nerfs/buffs might be more flexible, with faster responses to the new gimmicks/crap due to overpowered/underpowered versions.
Disappointed by not hammering down Shadow Form to the ground. It got nerfed but obviously works good enough to be invincible tank in PvE, what is a tad too much. Sins still can run most dungeons, big chunk of them can be done completely solo in just a few minutes; UW can still be SCed.
SF should have never existed in GW in its form. The general idea behind the skill is cool, but it just breaks the game's mechanics.
The AP nerf might be targeted as well to kill N/A MoP spammers, not only Discordway. Even though i'm a Discordway-user for a long time now, i totally agree that AP should be nerfed. Not smitersbooned, not incinerated as SF should be, but definately made less powerful.
Talking about MoP spammers, the Manlyway - and MoP + 100b/Whirlwind in general - is stupidly overpowered meta in the current PvE. Providing the example of the current meta Raptor farm is enough in my opinion - ele, mes, sin, monk can't farm them effectively, whilst W/N and N/W with 100b + MoP can still get the top times.
It's of course only top of the iceberg. Manlyway, in general, is a problem, even without a dedicated N/A AP MoPer, with necro hero throwing in MoP instead. There's a thread in High-End PvE section where one guy cleared HM Deep with only three heroes - and kudos to him, congrats and the stuff, but it CLEARLY shows how a warrior on 100b, backed with MoP, is overpowered.
Speaking of meta OP builds, i hope DwG gets nerfed as well. It's cheap, has pretty much no recharge and deals insane AoE damage in team builds. Adding exhaustion to it should do the trick just fine.
ER ele infuser/bonder should have been nailed down a long time ago as well, back when SF got nerfed or even earlier. Despite it's sheer defensive/healing power, it's plainly ridiculous that an elementalist can easily outheal a dedicated monk and ritualist in their main party role.
While nerfing healing eles, they certainly need some sort of buff for high-end PvE. They can only run wards, snares and, to some extent, air magic now, which isn't really viable and is obviously subpar to most other classes in HM. It would be nice to see eles brought back to their main role from the very beginnings - nuking, aka dealing damage, rather than excel at healing and tanking.
When it comes to sins in PvP, Coward! should get tied to Strength a little bit and/or made half-range shout, for the very least. I don't play GvG, but i feel it's one of their biggest gimmick right now.
Speaking of PvP nerfs, i seriously hope that the TK takes not only GvG, but also other formats into consideration when updating skills. While i can agree, to some extent, that GvG should be the main focus, even RA and AB should be taken into account when nerfing/buffing certain classes and combos, so that the other arena isn't broken just because GvG needed to get rid of two popular gimmicks.
Focusing on mesmers in PvP, i don't really see why VoR itself should be nerfed. I agree that hexstacks are bad and overpowered, but it's not VoR's individual problem. Mind Wrack is much more of a concern here, as well as hex-spamming necro.
I certainly hope that most of GvG-focused changes will have PvE/PvP splits (besides, as mentioned above, taking other arenas into consideration). Remember that if something gets nerfed in PvE, the monsters are getting nerfed as well, so that nerfing PvE skills doesn't always mean increasing the game's general difficulty.
Some PvE-only skills might get a hit or two, though - longer recharge for YMLAD & higher cost and cast time for PI would be a good start.