Capcom announced on their Twitter page that the next MH 4 U DLC pack will be downloadable on September 4th.
New #MH4U DLC comes out on Sept 4! In the meantime, make sure to get the August DLC http://t.co/6vmMhn8EMD https://t.co/uFTsVzxCgp
— Monster Hunter (@monsterhunter) August 25, 2015