Hmmm. At the moment the Peatlands Way
website is listing April 28th as their provisional date for 2012 too ...
Given that the Fellsman has filled up (or very nearly so) for the last three years and that the last running of the Wye Forest 50 filled up before Christmas (and the 2012 one is over half-full already just from online entries), my guess is that it will be the East Yorks events that suffer shorfalls if there are any.