Nova -- StarCraft II
All right, so StarCraft II isn't exactly "upcoming" in any sense of the word (it only recently went free-to-play last year), but Nova's constant reappearance in other areas of the Blizzard world means something. It also helps that she sports a fairly consistent character design across all of her appearances, making her a pretty easy character to cosplay.
She's a prime character in Heroes of the Storm, and her character design recently made the jump to Blizzard's big-name shooter Overwatch, as well as a skin for French sniper Widowmaker that should do wonders bringing back this blond bombshell.
For any cosplayer with a love of LEDs, Nova is a great choice for a simple, streamlined design... and yet she'll always manage to catch your eye on the con floor. And if you don't have Widowmaker-level booty, Heroes of the Storm has a ton of new source material for alternate Nova skins that should keep the inspiration machine churning for months.
(Hero image source: youtube)
(Secondary image source: DeviantArt)
