3) As an advanced player, I want the option to show numerical cooldowns on my abilities so that I can better time them.Head over to the page below to read more.
We're really trying hard to avoid quickly bloating the game options, and since this would be an option, we're cautiously approaching it and a few other toggle/option requests. Short answer, probably not right now.
7) As a Wizard, I want to see a buff icon for "Magic Weapon" and "Familiar" so that I can know its current status.
We're adding a buff icon for Magic Weapon in 1.0.3. We don't intend to add one for Familiar as it's a physically visible object on your screen. Magic Weapon was actually impossible to tell if it was up in quite a few cases. We'll be continuing to watch skills and buff icons, though, as there could be some situations where we need to expose more.
15) As a player, I want to see what difficulty my friends are playing so that I can know if I'll be interested in joining them.
We have some great social window and quick join improvements coming in 1.0.3, including showing the game difficulty they're in, who else is in the game with them, a bunch of just nice usability and UI changes, as well as making the quick join window smarter by limiting who is shown to you by level and difficulty.