To recap the differences I can see from the pics:
1) It's a completely different jersey cut/type than what they've been using ever since Nike started outfitting Iowa. You'll notice it more when you see them in person or in a better pic/HDTV. The different collar type is the most noticable element of that change.
2) It looks like they went with 8" numbers on the front instead of the normal 10".
3) The numbers on the front itself are a thicker block font than prior jerseys.
4) Removed the white piping from the Tigerhawk.
5) Added B1G logo.
Hopefully the names on the back will still be in gold.