Can we chose the size? That's better than I thought it was.
By what has been shown, there are three different sizes - small, medium and extra large.
I understand small = tiny icon like Android and iOS icon.
medium = current WP7 like
extra large = a little bigger than our calender and picture tiles.
So ideally,
My WP8 will have following extra large tiles:
Email, Messaging, ME tiles - where I can see scrolling notificiation with texts saying what exactly it is.
I will have medium tiles for WhatsApp, Skype, etc like apps where I need to see number of notifications
and a row of tiny icons for those apps that I use less frequently but hate to go and find.
BTW, now that I've written this, I have a feeling we WON'T have a separate notification area in WP8. Instead, users will be able to choose tile size to have scrolling notifications in full, or just number of notifications like current set up or nothing.