So newren blogged about baz not supporting -p last thursday.... we were kinda busy leading up to a release - but thanks to Aaron Bentley, we've now got -p support built into baz.

baz diff -p to your hearts content newren :)

As background, before we added this, diff output went into the archive as-is, so changing its format changed the archive format - potentially breaking third party tools, or even Baz itself. Now we internally differentiate and can do whacky parameters if we want to.