Just a main thought: Keep it simple and 'stupid'. I see all the suggestions for features. Oke. Understandable. But I personally love simplicity; keep up the blue-print and the main goal voor Orion. Do not make it too complicated.
Just a general suggestion for all the features that are suggestible: hold on to a bare-bone/blue-print. Do not get too messy. I like the Orion browser for its logical structure. Oke I'am cursing in the... but take a look at the SigmaOS browser. (Has some basic technical resemblances e.g. webkit). It is rather basic but therefore easy to use.
Orion developers will have a lot to do to keep all of it working. So my suggestion for all the suggestions for features coming ahead: pick the ones that are really important and keep Orion easy to use and lean, mean and dirty (in the good sense).