Trying to find out, but there are unstoppable trailers so far. Like, can't even fast forward either.
EDIT: Zero special features. Disc 1 has two unskippable trailers. One for Stranger Things season 2, and the other for Defenders. So about 5-6 minutes before you can do anything, which is complete bullshit.
Disc 2 has no previews, so loads quickly at least. Disc 1 did ask if I wanted to resume when I put it back in, but if you say "no" it goes right back to the trailers and you wait again. So basically resume, then hit the menu button to save time.
Sound is Dolby True HD, so that is a nice upgrade over streaming. But man, the trailers are a shitshow.
And while the packaging looks awesome, it is rather flimsy and cheap feeling. The discs are on a small cardboard tray you pull out when you open it with foam stoppers.