I have played with the beta and really there hasn't been a lot of changes GTD wise. It has a more consistent Apple look&Feel. In any case for me there is one crucial thing that will hinder me from upgrading in real life. Palm syncing has been excluded and the old conduit doesn't seem to work anymore.
They suggest using sync services with Missing sync but I don't want to go through the whole procedure to get that up and running 100%.