Why would you want any Apple machine for high-end gaming? What a joke. Get a console or build a gaming PC.
Consoles or building a PC isn't much of an option if you want to game whilst staying portable...
Also, PC laptops are a total carpshoot when it comes to quality, and often suffer from driver issues where their mobile GPUs need special drivers that aren't being updated by the laptop manufacturers (because they don't want to support 700 different driver versions...and hell, they'd rather not support you at all when it comes down to it).
My dad bought a mid-range HP unit to replace his aging Dell desktop this past winter, it has a plastic chassis, one of those flimsy pop-out optical drives that feel like they're gonna fall off just by touching it, and both the touchpad and the wired networking need standalone drivers to function. They're not innately supported by the OS. Plus the screen has terrible contrast and color reproduction, angle it slightly wrong and you can barely see what's going on...
I'm a PC person myself when it comes to desktops, and I don't own a MBP (yet), but I'd never buy a PC laptop... Not in a million years. Apple units are generally speaking better built, have better keyboards and screens, use fully integrated and supported components, and you won't break off the charger plug from the circuit board either if you happen to step on the cord.

Plus, they tend to look sleeker too, if that's anything to care about.
That said though, I wouldn't expect Apple to release a laptop built for gaming, ever... Considering their iOS devices represent the vast lion's share of company revenue and profits, and Apple's never really wanted to acknowledge that games even EXIST, I just can't see it happening...