[2510c39011c5]

notice the release dates for the recent issues...

  issue 66:  2009-11-06
  issue 67:  2010-11-17
  issue 68:  2012-04-14
  issue 69:  2016-05-06

the intervals: 1 yr -> 2 yr -> 4 yr

Are they now on an exponential backoff tendency? Will their next issue come out in 2024?