What I am thinking of is the same look-alike as now: Pixelpost should come with RSS, Comments, Languages and Paged Archive, with categories and tags and all what our users are used to use.
The difference should be behind the curtains: all those things should not be implemented in core code but in separate files, call them modules or addons, turned on by default, so migrating to 2.0 is as easy as now.
But all those things should have their own settings (like they have now) where they can be turned off if not needed (what they don't have now).
So for all users there will be no difference at all when using Pixelpost. But those users with special needs who don't care about categories or comments or languages or tags can really boost up their photoblogs speed by turning off what they are not using.
Everything shall remain in the database ready for use, but it is called only if really needed.
This is my imagination of Pixelpost 2.0 :-)