Joe - per the original PGI announcement, for those that currently own shares in a brokerage account, the account will be credited, those individuals would not be receiving a certificate. From the 8/19 PR:
The Company will issue a 1 for 1 stock dividend certificate to all shareholders of record up to the date the dividend shares are distributed on September 15, 2011. Shares held in brokerage account will have their account credited by CEDE electronically.