The catch: you'll need a new or new-ish Windows 10 PC with a seventh-gen Intel Kaby Lake processor and 4K display to take advantage. So, your options are basically limited to the Lenovo Yoga 910 and a handful of gaming laptops and desktop machines at the moment. Assuming your hardware is good to go, you'll also need to upgrade to the $12 monthly Premium subscription with Ultra HD streaming. Users with older Home Theater PCs are still out of luck, unfortunately.
On the bright side, the new partnership with Netflix -- which includes getting Gilmore Girls: A Year in the Life in 4K a few days before everyone else -- gives Redmond the opportunity to tout battery life improvements they've made to their very own Edge browser. According to Microsoft, you'll be able to squeeze in one more episode before your battery dies if you're streaming on Edge instead of Chrome. Of course, a Chromecast Ultra would also do the trick.