Yesasia confirmed with me that the 3D blu-ray does include 2D mode:
Dear Valued Customer,
Thank you for writing to YesAsia.com!
In reference to your enquiry regarding item "The Monkey King: Uproar In Heaven (Blu-ray) (3D) (English Subtitled) (China Version)", both 3D and 2D are available, you can change the mode yourself.
I placed my order!