That focus ST you saw will probably be a "demo" use only for display at a car show. It may give Ford an opportunity to show the public of what potential the ST can do. May also hit this years' SEMA.
.....Or you may have saw a car built strictly for Jay Leno
2009 Cobalt LS XFE U74
Mods: K&N Typhoon Intake, Option Cat-Back Exhaust, Cosmo Short shifter, Maxxim Ahead 17X7's, MPx shorty antenna, FE5 Strut/shocks, Tein S Techs, Moog endlinks, Moog spring seaters, ZZP shorty header, LSJ downpipe, LNF front grille