Upgrading from Internet Security 2008 to 2009

Hi, I have a couple of questions about upgrading from Norton Internet Security 2008 to 2009. The questions may seem to have obvious answers but Im not very knowledgeable so bear with me. I went to buy my annual internet security upgrade but instead of finding more expensive product boxes for the full product and cheaper ones marked upgrade, there was only one type. There was also a more impressive sounding premier product that was cheaper, yet seemed to contain the same features + more. Are there no upgrades this year? What's the difference between Internet Security and the Premier Version? The boxes are also very small, looks two small to hold a CD, is the software still on DVD or is it now downloaded from broadband? Many thanks in advance.