We were going to wait on a presser for this one, but quite a few people are sending it so it's probably a good idea to get it up. High Roller Pony Con over on Twitter has announced that they will not be returning this year. There wasn't any major drama or anything causing this, just con-runners not being able to do another for the sake of cost and workload.
You can get the video discussing it below.
(That being said, their mascot is still 10/10)
— High Roller Pony Con (@HRPCVegas) September 19, 2018