This is what I see on united.com when I try a sample LAX-HKG itinerary:
China and Taiwan special
United is making it easier than ever to travel to China and Taiwan
It's not just United's convenient schedule to Beijing, Hong Kong, Shanghai, and Taipei, it's the low fares that make visiting such a breeze. For travel from now through the end of February, we have slashed prices from all over the U.S. to these historic and majestic destinations. And remember to always book on united.com to find the best deals!
Unfortunately, I can't find any more details anywhere on the website.
The all-in price was $510.70 incidentally. And that was without applying the purported 15% discount.