Chris Forsman at Ars Technica:
Though it hasn’t publicly stated its plans, Google has apparently been working on its own mapping app for iOS since this summer and plans to have it ready to ship before the end of the year. However, inside the company there’s little hope for Apple approval. Instead, Apple is expected to “keep moving forward in an effort to make its obviously inferior product better,” and “save face” with the public.
Apple would look really bad if they don’t let this through – barring any technical reasoning.