Well, a unified notifications tile could be the first tile and I am assuming i can size it to my liking.

I visited the pop-up store at the mall over the weekend. One thing I didn't understand is, if a live tile is getting updated, does it mean I need to open it and then the animation stops ( when I go back to the main screen) ? 

What if the tile that is getting a new notification is outside of the initial screen ? if I never scroll down (or don't scroll down often ) then I miss a notification ?