As first reported on AutoSpies.com Seal grey is being discontinued on 2007 911's.
The new color that will replace it is 'Meteor grey'.
There is also a rumor that 'Cobalt blue' will also become a no extra charge color on 07' 911's...
Thanks to Slim for the tip.
Note to Porsche: We hope they take our constructive criticism and add some more interesting colors to their car palettes. Add two or three new colors per model year to spice things up a little.