thesandtrap.com is reporting new putters from SC this fall. With the
success and recent addition of the Studio Select series, it would seem
that the Circa line (which has been out since 05)is slated for
departure.

Here's the link to the article...

http://thesandtrap.com/columns/bag_drop/fall_2008_sneak_peek_titleist_90
9_metals_series

The hint falls at the end of the article in the "conclussion" section.

Ryan :)