Google has a tradition of reinventing a service that Yahoo! already has (Gmail, Maps).
I would be willing to bet that GPortal is around the corner. How will Google be able to reinvent that bad boy? This is where Ajax comes in.
Ajax finally delivers on the vision of the portal/portlets. None of the annoying lifecycle issues, and change pages when in different modes... now the components can really have a nice lifecycle and the portlets can change in the page itself.
There will also be a nicer way to rearrange your portal (like this example).
I can't wait to see it ;)
Read: My Google: Prediction for a Google enabled portal