I'm surprised it's taken this long. I thought you would be able to stream all of your media from your Mac to your iPad on a local network day one. There are apps available for this that even include streaming over the net, but Apple really needs to offer this built-in on iOS out of the box. Turn on your iPad/iPhone/iPod and see all of your pictures, movies and music sitting on your Mac instantly. I've been waiting for this.
The Plex app along with the Plex Media Server on your computer performs these functions quite well. The app is $5 and PMS is free. Built in by Apple would be nice, but not necessary when others are doing it well, and cheaply.
Facebook and Twitter. This isn't about just sharing pictures and video anymore, so I expect this to be part of a move into FB territory, don't you?
Welcome to the boards, noob.