Features are great, but what i think is most important is cross-platform, cross-browser compatibility. Please make sure that the new version displays well in all major browsers and platforms, including the IE 6 legacy browser. I find that to often the answer to IE problems is "have your users upgrade" or "switch to Firefox". This is just not always possible or realistic.

I would like to see proper documentation for developers who need to make changes such as making Dolphin see more more "social" and less dating.

It would be nice to see a proper integration of PHP into custom blocks on the page builder.

Also while the page builder (6.+) looks cool, it is really to slow for developers who want to make quick changes and additions to their pages).