As I understand it...those holding shares as of August 3, 2015 will receive 1 for 1 share of $PURA
If you had 100,000 shares on August 3, 2015, you get 100,000 shares of $PURA. Any shares purchased after August 3, 2015 are not eligible for the dividend...that date was not moved/changed.
It looks like they are planning to pay out the dividend by December 31, 2015. (See last page of the quarterly report).