Well by the time anyone serious reads this, it's probably too late. But I'd like to make a few notes on the racials and their effects on PvE. They're all not that far off from each other (in order of 10-20 dps), but for the min-maxer, there are some points to consider. So in order, what I think would make the best PvE rogues.

The Top 3

Orc - Blood Fury, increases attack power by X but reduces healing effects by 50% for 15 sec, 2 min CD. Attack Power scales with level with the formula 2 + lvl*4, so at level 70, it's 282 AP. This I feel overall gives the best reliable dps boost. It's basically a free trinket type ability that you can coordinate to burst damage with your other CDs.

Human - 5 Expertise with Swords and Maces. With Sword spec currently being the best PvE spec, this talent effectively gives you 1.25% more hit. In a raid buffed tank and spank scenario, this talent can provide the most dps.

Troll - Increases attack speed by 10%, 20%, or 30% for 15 sec depending on current hp, lower hp gives more speed, costs 10 energy, 3 minute CD. Now potentially, this can be the best racial, but to get full use out of it reliably is another matter. You'd have to take enough damage and pop it then, but you may get healed before that happens. You'd need a Patchwerk-type fight to truly maximize this. Most of the time, it is just popped whenever it's off CD.

The Next 2

Blood Elf - Arcane Torrent, gives you 30 energy back, 2 min CD. It's decent, nothing huge, basically an extra attack out of it.

Night Elf - No particular racial, but Night Elves have the highest base agility out of all the rogues. Only a few more for that extra stat of dps.

The Hard to Quantify

Gnome - Escape Artist, removes movement impairing effects, 1 min CD. For those fights that lets you use it, gives you more DPS time which is more damage.

Undead - Will of the Forsaken, immune to fear/charm/sleep effects, 2 min CD. Just like above, for the few fights that do get you to use it, gives you more DPS time.

Dwarf - Nothing. Well Stoneform, immune to bleed/poison/disease, 3 min CD. This is just more of a survivability thing, which could be very useful for those certain fights.