Priority Club has just launched their new promotion, which runs from September 01, 2013 to December 31, 2013.
Here is the Flyertalk thread that tries to find out what it all means. Once you register with your account you will see your dedicated offer ranging from 50,000 to 150,000 bonus points. Here's what I received.
Try one and done
Stay more & earn more
Explore our brands
Get out there
Win in a weekend
Complete all of your offers and receive 34,000 Points
It's too early to say if it makes sense to book stays for the bonus points offered. These challenges are similar to the Grand Slam that US airways used to offer each fall. It's wise to wait a bit and then read the Flyertalk thread to see what works for the lowest investment.
I do appreciate that IHG has taken the time and creativity to come up with a new promotion that is also a challenger – smart move!