Maybe HID headlamps will be offered in the higher trims, but I doubt we'd be getting Xenon lights. Hopefully LED is going to be an option too. Best we can do is look at what's offered in their current SUV/Crossover lineup and make a guess.
Sometimes with the introduction of a new model comes new practices and launch of new features so the Blazer could very well be one of those showcases. Tahoe and Suburban sell themselves, its a classic recipe that requires little change. The Blazer is what they really need to sell people on.