The Brew Potion and Scribe Scroll features are really lame. First of all, I'd rather any sufficiently magical character (priests, non-magic characters with certain feats) be able to do this with the downtime system, not just mages. Second, it suddenly makes magic shops a lot weirder: "This potion costs 25 gp, but only if you drink it within three days; otherwise it's 10,000." "I sold a scroll to a Tiefling in Sigil. I don't know where in the multiverse he is, but I know that somewhere on the planes there is a scroll with my handwriting on it."
Also: I really loved the "use an item" mode of Cunning Action in the livestream. It seemed to make the Thief very versatile and fun. I wonder why they removed it. Now it's just a double movement power.
The Baldur's Gate documents are interesting, too... MAJOR SPOILERS FOR THE UPCOMING ADVENTURE AND THE ORIGINAL COMPUTER GAMES:
[sblock]There's a 2nd-level human warrior NPC called Abdel Adrian (the name of the player character from BG and BG2, according to the novelizations). A later entry mentions how some characters can become Chosen of Bhaal, but the list doesn't include Abdel. Perhaps he's there just as an in-joke for lore nerds, since it seems hard to imagine a 17th-level human surviving 100 years later as an NPC who doesn't even have any class levels.[/sblock]