• App Store
• Custom widgets
• Improved console
• Form generator (especially for demos)
• UML compliant models (oh no, that's not there yet !)
• Improved modeling UI (once you get used to it)

• Custom widgets
• Complex objects in webservices
• Automatically generating forms
• The new console
• Searching
• Improved Eclipse integration

• Form Generation
• Better Security
• Custom Apps
• Programming in Eclipse is much better.
• ISS configuration

• Custom Widgets
• New Theming capabilities
• Search Function
• New Console
• App Store: Deeplinking, HTML snippets, Google Maps

The most visible improvements are already mentioned, but what do you think about:

• The new Document Template DSL for exporting your data as Word, PDF, HTML, Open Office, etc.
• The new Microflow Debugger, much more visual.
• Autonomous modules, which enables App Store sharing.
• Support of right-to-left languages for our Arabic friends.
• Anonymous users, i.e. build public websites.
• Conditional formatting of almost all elements on a form based on security.
• Find unused items in the Modeler.
• View the dependencies between modules in the Modeler.

Just to name a few additional improvements ;)

I love the Search function, really helps you navigate big projects when you know what you are looking for but don't know what folder/module it is in!

Custom widgets!!!