-I think two more whole action bars visible on screen would be cool. I would even like to see them only appear when you enter active mode.
-I don't know about having both vertical and horizontal action bars.
-Drag and drop, {yes please}
-Maybe for each of the additional visible action bars, they could be automatically sized smaller as they scale up into the middle of the screen. (that being said IF the extra bars are stacked on top of the original).
-Auto saved action bars are on the official to do list. woo
-I love the circular design for the icons.
-I don't think pet classes will need there own 'individual' action bar, since a majority of their skills are going to be designed around the pet. A players action bar set-up can mimic that from something like WoW or w.e anyway.
-Tool tips should stay. I'm not a fan of the exact %'s and real numbers in the descriptions. But to each his own I guess.
-If you are referring to add-on's, I say NO.