iPhone 4 vs iPhone 5

I have a iPhone 4 right now from Verizon Wireless, but when my contract ends I think of getting the iPhone 5. Tell me your opinions of changing from the 4 to the 5. What are the specs, the advantages, and the disadvantages of changing. Is it worth paying the money to get a new iPhone anyway or should I just wait to see what the next iPhone has when it comes out? Thank you very much for your help