Do I need to get a new sim card for an Iphone 5?

So I saw that the new Iphone 5 has some sort of new sim card tray. I already preordered the phone from Apple. I'm upgrading from the Iphone 3g and I was wondering if the sim cards got smaller. If they are, do I have to go to AT&T myself to go get a new one or does my shipment come with a new sim card installed? Would I be able to transfer all of my contacts, etc?

What about the screen colours of the new iPhone 5?

I noticed that Samsung Galaxy S3 has a really good screen, not just big, but the colours of the images and the videos are really great, it seems to be watching a small television, not a phone.
What can you say about the screen of the iPhone 5? Is it as beautiful as the Galaxy s3 one?

(Sorry if my english is not good, but I'm Italian, and here the iPhone 5 is coming out on the 28th of September; this is the reasong why I'm asking to you Americans)

Is there an Adapter for Samsung Galaxy s3 to convert the iphone 4?

I have searched with out getting any answers. I have an iphone 4, but do not want the iphone 5. But I love my dock. I want the samsung Galaxy s3, and am wondering if anyone knows if there's an adapter, I can get that will still allow my to use my iphone dock with the samsung galaxy phone?

Are the cheap iphone 4s glass replacement parts as good as expensive ones?

I just bought my iphone 4s yesterday, and dropped it in my driveway a few hours later! My brother is an electrical genius and will replace the broken glass for me (front of phone), but I need to order the parts. There are so many options with some as little as $1 and some as expensive as $30-$40. How do I know which one to buy? Are they all good?

What are the must have apps for iphone 4s?

I have been searching for good apps in store. But it seems very difficult to find a good one.m searching for some apps that uses d iphone features like coverflow, gryoscope, and bla bla bla.

How to transfer my self made ringtones from my iphone to the pc?

Made my own ringtones using Itunes. I recently had to uninstall and install a clean itunes since the update did not play any of my music. Now all my ringtones and playlists are gone. How to I transfer my tones and musci from my iphone to the pc to avoid having to make them all again. I have over 300 ringtones and 3 GB of music and will take too much time to do it all.

If i update to iOS 6 will my game data get erased?

When i updated to iOS 5, many of my games (those that don't save to the Game Center server such as PvZ and Angry Birds) got all their data erased and I had to play all the levels and get all the achievements again, which is sometimes fun, but I don't really want to do it for a third time. Will updating to iOS 6 do the same thing or did they change something with iOS 5 to prevent that?

If it is all going to get erased, I probably just won't update. On that note, is there a way to tell iTunes/iPhone that I don't want to update so stop asking?