The Skylum Luminar 4 will be released on November 18. The current pre-order price on Skylum's website is $79:
B&H now also sells the new Luminar 4 for $59 with promo code ODPHOTO (sale ends 11/18 at 11:59 pm):
Here are some of the new features in Skylum Luminar 4 can be found here.