Just installed SQL 2012 RC0 specifically to check out the new stuff in Power View, have a look at http://blogs.msdn.com/b/robertbruckner/archive/2011/11/17/what-s-new-in-power-view.aspx to see all cool new features, however there are few things that I would have loved to have seen included.
– Support for Hierarchies
– Cards or Tile region slicers, the addition of grid filters is cool, but if you are filtering cards within a region that contains a grid with related measures it does not get filtered.
– Font control within grids and cards
– Image size control
– Dimension attribute aliasing
– The abilty to publish documents that cannot be edited.