Here is some information from PIs website.
Notes View
The new Notes View lets you view simple notes, event notes, task notes, and brings it all in one place.
Contacts View
View and manage contact information directly within Pocket Informant.
Task Smart Groups
In addition to the built-in groups currently available in Pocket Informant, you can now create your own custom Smart Groups to automatically group your tasks any way you want.
New Sync Options
Major upgrades to our already-powerful sync engine.
Upgraded Interface
Version 2 is not only more powerful, it's also more usable. We created the smartest and most versatile tab bar we've ever seen, a new date picker, and a lot of polish.
Hope they don't mind I posted it here.