As you might expect at launch, 4K streaming is restricted to a limited number of titles (originals, Bond films) and platforms (Xbox One S, PS4 Pro). However, unexpectedly, there’s no additional fee for the increased visual clarity — as opposed to Netflix’s UHD tier. Also unexpectedly, there remains no confirmation that Hulu provides 5.1 surround sound.
On the profile front, Engadet indicates the feature is rolling out in phases, beginning with a limited number of customers accessing Hulu via web site. As to capabilities,
When a viewer creates a profile, they will be taken through a taste picking experience where they will be able to tell us the types of shows and movies they like, and the types of shows and movies they don’t like. This will help us ensure that each profile surfaces recommendations and content that is distinctly personal to each viewer. Each individual profile will have its own name, personal info, viewing history, recommendations and Watchlist. There will also be a new Kids profile type, which will allow our young viewers to browse content within the Kids Hub freely, without having to worry about running into mature content.