"There are a bunch of new ‘transitions’ between elements. I don’t know what the battery cost actually is for this, but as a user I just don’t care about cute transitions between elements. I want fast interaction with my mobile device."
This is poorly phrased at best. Transitions exist to make it obvious what is happening: e.g. you minimize a window and it zooms into the taskbar/dock, as a visual reminder that it's not gone, just stored there. This kind of thing is even more important with an unfamiliar interface.
Are the particular transitions he's complaining about bad? I have no idea, since he just wrote about transitions in general, without specifying any. Not all transitions are good, but writing like they're all pointless suggests that you just don't understand UI (and I'm not a UI person, just someone who reads a tiny bit about it).
Edit: Just looked at the formatdoc. Is there a way to quote text without getting those scrollbars?