First I noticed the changes to the mail system. You can now attach up to seven items to a mail message, making my use of the CT Mail Mod obsolete. Also, when you hover over the mail icon now, it tells you who has sent you that letter waiting for you in the mailbox. I know the new hover icons with NPCs were already on the PTR, but their addition to the game makes navigating cities a delight. Each icon tells you instantly who has a quest, who can repair, and who just wants to chat.