renata colella/Shutterstock On top of the  things you need to know about buying a Roku streaming stick , you should also know that the way Roku customers control certain content is about to get an upgrade. Along with Roku adding a new method for subscribing to a premium streaming service, the company is also delivering a new cloud DVR feature that's soon to expand to other services. Roku users can now subscribe to NBCUniversal's Peacock Premium Plus directly through their Roku accounts. Peacock is joining a list of other streaming services that have this option, but it's also arriving with new cloud DVR-style controls previously unavailable on the platform. Users will be able to control live streaming content through the new feature. Roku users will be able to purchase a Peacock Premium Plus subscription for either $16.99 a month or $169.99 per year, which is the same price as buying the service outright. Note that you will need a subscription through Roku to access the new DVR features.…