I don't have any numbers, but anecdotally the number of applicants last year shot up dramatically. I contacted a number of programs after I applied and they said they were swamped with apps, so apply early. I'm sure someone may be able to comment on how competitive it is this year.
From what I understand the job market is still good if you are anesthesia trained pain doc. I'll be searching after the boards in July, but the graduating pain fellows from my program didn't have any problems landing a job in the geographic region they wanted to go to. Can't speak to the earning potential, but I might have a better idea in a couple of months.
Feel free to message me with any other questions.