Unless you use them for a stay at a HGVC resort in 2008 (i.e. B-4 2009), you are SOL.
From another thread...
October 15, 2008, 07:35 PM, ricoba wrote:
"If you do rescue the points (2008 points), which I have also done in the past, remember the points must be used in 2009 at a Hilton developed/not affiliate resort."