Dido, but my guess it has something to do with creating a separate 2015 leader board also. I remember early 2014 when the "life time" and "2014" boards were being created there was a long delay too, probably because its limited data when the year changes for that year. Just a guess.
I'm also wondering about PvM leaderboards... I am pretty sure they have not been updated for at least weeks. This is both the personal statistic where it tells you how many monsters you killed (the one you get when you click "PvM Profile" in [wallet - the very detailed one you get when you click "Monster Kill Log (Public)" does update) and the one from the monster pages of the compendium.
