I'd probably put the 2to3 thing at the bottom of the list, because as awesome as it is, I'm not sure if users actually care. Sorry Chuck :-).

We could add one sentence each to the gufunc and .at lines to make clear how awesome they are to people skimming, before they go read the full paragraphs below. "For example, calling np.linalg.inv on a 100x10x10 array will now invert all 100 matrices in a single operation." "This provides a version of arr[[1, 1]] += 1 that actually works."