This is hard to answer without knowing how you built your character, and what your priorities are. Are you intending to go hardcore into the multiclass? Because if you're dipping, you'll have different priorities than if you're going all out. As a dipper I'd accept your current stat line, because you'll be using Eyebite in situations where melee isn't appropriate, and you'll be able to deal with the lower attack roll. But if you intend to take further multiclass feats, particularly the encounter power one, you'll want a better attack bonus from your charisma.
It seems like you used the standard array, and your initial scores were "10/16/12/11/13/14," which you have written in
3e order, exactly as I always do right before I erase them and rewrite them correctly for
4e.
Is this a hard limit? The array works really well for most characters, but multiclass is finicky and I might try point buy. In that case, I'd restat as 10/12/16/10/10/16. Its a bit boring, but it gets you where you want to go. You could even drop Int to an 8 and rely on the Eladrin bonus to improve it, then invest the points somewhere else.
Another option is to be a Halfling instead of an Eladrin, and get both dex and cha bonuses. Halfling rogues are a strong option anyways.
Does Int matter to you for Ritual Casting? It would be a nice "turn up to 11" type addition to your character, since it provides so many options for customization. And scoping a target with scrying is thematic for a rogue/warlock. If you intend to get Ritual Casting, I'd keep the 13 Int, otherwise I'd drop it.
There's not much else you can do to pimp out your level 1 character. But I'd be taking a hard look at Otherwind Stride, the level 3 fey warlock power that lets you teleport and do damage to those adjacent to you as you vanish. Its an excellent mix of mobility (to get a flanking position) and area of effect damage (close burst 1). Attacking multiple foes makes up for not having the best attack bonus from charisma, and the powerful Effect entry means that you'll be getting good mileage out of it even if you miss with everything.
For multiclass utility powers, you have a lot of options, but nothing jumps out. If your rogue has a shtick, like "jumps really well" or "is very stealthy," there are options to improve your talents at this from either class. But for flavor, I'd make sure that the best of your utility powers related to this ability was selected from the warlock class.
For daily multiclass powers, I'd avoid ones with attack rolls, and go straight for Armor of Agathys. It does damage to adjacent enemies automatically, and requires no attack roll. Also gives you a handful of temporary hit points. Normal warlocks have trouble using this because being adjacent to enemies screws them, but you won't necessarily care. Also, it lasts an entire encounter, which adds more warlock flavor than a single round attack.
Personally, I wouldn't use a paragon path multiclass. I don't think you need it.
Eventually, you'll be needing special implements. My personal taste would be to skip the pact blade, and go for a dual wielded dagger and implement combo. It lets you customize the purpose of each weapon more efficiently, even if it costs more. And its cooler.
That's all I got for now.
And yet another word from our sponsors
