Yes, Wii U preorders get Deathstroke.
As well, the Wii U version gets the 'season pass' too, so you can count on that DLC making its way over as well.
I'm going Wii U on this I'd never touch the multiplayer no matter the quality (just not my thing), and off TV suits my lifestyle.
I'm so pumped for this game. It's unreal. Like it has been said, I have Rocksteady a chance on Arkham Asylum (which I thought looked like shit based on its Game Informer unveiling), so why not do the we for WB Montreal. They've made some interesting changes, like having the challenge maps accessible from the Bat cave and dole out XP. I'll actually play them this time around.