Wouldn't be surprising. GUO and Keeper of Secrets are the two Greater Daemons that don't have a new model yet. Much like it has been Khorne (bunch of AoS releases) and Tzeentch (new wave pof Daemons, Thousand Sons) had their day, it appears to be Nurgle's time at the moment. Easy to tell just by the dice they were handing out for the last Path to Glory (or whatever name it goes by) promotion.
And really, the old model needs to go. It's maybe not QUITE as bad as the Keeper of Secrets, but that's only because ugly is more acceptable for Nurgle's disciples... and even then it's close.
Ask not the Eldar a question, for they will give you three answers; all of which are true and horrifying to know.