-- Elf --
The Elf gains a Dex/Int build, and becomes a competitor of Eladrin and Shadar-Kai. Dex/Int, however, isn't a very popular stat combo and only used by Wand Wizards and Cunning Sneak rogues.
(...)
The main benefit of the Int bonus is that the Elf now has +2 to the primary stat for a number of arcane classes - the Artificer, Swordmage, and Wizard - as well as a secondary stat for Bard and Warlock. The Eladrin, with his +2 racial bonus to Arcana, Fey Step and excellent feat support still reigns supreme here, though, unless there is a different race with a better stat match.
I have to disagree here. Elves were already a top-tier pick for Wizard, and for any other Controller, since for a Controller
hitting is everything and even with a net -1 to attack, the re-roll on a brutally debilitating Daily or Encounter is more than worth the -5% accuracy.
Now that Elves get the +5% attack bonus, they're probably the best Wizards around. The +2 Dex isn't wasted, either: it means you can put an 11 in Dex, a 14 in Wisdom, and still qualify for Dual Implement Spellcaster in Heroic and Wizard Implement Expertise in Epic. That allows you to put an 18 in Int, to which you then get a racial bonus. Nasty.
Granted, Elf Wizards took a significant hit when the Orb nerf came in, but Wizards still have enough lockdown effects to matter.
-- Eladrin --
The Eladrin gains an Int/Cha option, which moves him on par with Changeling, Tiefling, Gnome and Shardmind.
There are builds in 4 classes with an Int/Cha pair: The Cunning Bard, Telepathic Psion, Fey / Dark / Infernal Warlock, and the Enchanter Mage / Orb of Deception Wizard. Except for the Infernal Warlock, which is pretty much written for the Tiefling, the Eladrin now takes the crown in all of these builds. Not only does their background fit very well, with Fey Step, a free skill, Arcana bonus, +1 to Will, and tons of feat support, they offer the best class features.
Don't forget about Lazy Warlords. There are some hilariously awesome things you can do with a high Int bonus as a Warlord, and throwing in a Charisma bonus only helps.
Lazy options are why Warlord hybrids well with pretty much everything, and Eladrin have some great support options for being Warlords already. A full-on Warlord going into Spiral Tactician or Battle Captain will greatly enhance any party -- make an Eladrin Warlord focused on Str/Int (16/16), while not neglecting Charisma (also 16, but not benefiting from level bumps).
On the other side, make an Int/Cha Eladrin (18/18), ignore Strength, and use lazy options (hybrid Int or Cha class | Warlord). You'll grant a lot of passive bonuses to your party, and you'll have some nice options for when your other class isn't appropriate -- like having the option to use Commander's Strike when you don't want to eat an OA for one of your ranged attack powers. Psion is a nice pick here, he likes both Int and Cha. Wizard & Warlock are snazzy too.
Either way, you'll benefit from strong Eladrin feats which were designed to compensate for their low Strength & poor stat synergy, which you will abuse by mostly ignoring Strength and having good stat synergy.
Cheers, -- N