Grandfather Nurgle's been getting more love just recently, I think -- GW have really built up the idea of a cycle of life & death in his fluff, & the merriment of his followers, so he's not just 'the plague god'. Tzeentch has had some boosts too, with his own dedicated cultists & Tzaangors, so that's cool. & Slaanesh is being mentioned more in AoS, so the Big S might be planning a comeback with some fun new stuff!
I feel like Khorne has always got a lot of attention because blood-frenzied barbarians is easy to render into a game, so it's good to see other Chaos gods getting similar attention.