I don't know if it will be signal orange, but it looks like an orange one is due out soon:
2011 Basic range release schedule as at batch A
Batch A - December 2010 9/?/? models (9/?/? released so far out of 100/75/75 + 0/0/0 recolors)
New
MB6/?/? Chevy Corvette ZR1 - white
MB9/9/9 2010 Infiniti G37 Coupe - blue
MB16/?/? 1971 VW-Porsche 914 - orangeMB20/?/? 1954 Jaguar XK120SE - dark green
MB31/?/? Honda Insight - blue
MB44/?/? Power Lift - lime green
MB57/57/57 2010 Mitsubishi Lancer Evolution X Police - silver
MB?/?/? MBX Mover - orange/white
MB86/?/? Cliff Hanger - red
2011 Matchbox releasesLooks like there will be a Lensey release as well:
Lesney Edition: Double Diecast
None released to date
To be released....
MB785 1971 VW-Porsche 914MB700 1963 Cadillac Hearse
MB784 Jeep Willys
MB129 Chevy Blazer 4x4
MB786 1957 GMC Stepside
MB799 1969 Volvo P1800S
MB321 1957 Chevy Bel Air Hardtop
MB771 Ford E-350 Ambulance
MB610 1971 Chevrolet Chevelle
MB500 1955 Cadillac Fleetwood
MB588 Dennis Sabre Fire Truck
MB616 1970 Plymouth Cuda DCC
MB713 1965 Austin Mini Van
MB322 1970 Ford Boss Mustang 302
MB539 BMW X5
MB801 International Brush Fire Truck
MB501 1956 Cadillac El Dorado
MB557 1965 Shelby Cobra 427 S/C
MB629 1969 Chevrolet Camaro Z28
MB097 Chevrolet Corvette T-Roof
2011 Lensey