The Series 3 figures will be Sayid, Desmond, Claire and Ben. However they will be delayed as per the announcement below.
In response to the new, abbreviated season on ABC's LOST, McFarlane Toys has adjusted the release date of the LOST Series 3 action figures. Originally scheduled to hit stores October 2007, the line's release is now scheduled to coincide with the television premier of LOST's fourth season in 2008.
Source: McFarlane Toys