Despite the ubiquity of semi-disguised Porsche Panameras making a secret publicity tour of the United States, we haven’t seen much of the 2010 Porsche Cayman since we exclusively unveiled it back in July. Now, an eagle-eyed Cayman Club forum member has spotted a trifecta of the updated sports cars winging their way into LAX. We’re sure it’s not a coincidence that they arrived just two weeks before the LA Auto Show.

Back in July we showed you an internal document that leaked renderings and details of not only the new Cayman, but the 2010 Porsche Boxster too. The biggest update is the addition of an optional limited-slip differential, which could just elevate the cars to 911 levels of performance. Check out the specs below and check back with us in two weeks for full coverage from the LA Auto Show.

• More power and torque in comparison to Cayman/S: +20 HP / +25 HP and +27 Nm / +30 Nm (2010 Cayman: 265 HP, 221 lb-ft; Cayman S: 320 HP, 273 lb-ft) • Performance differentiation in comparison to Boxster II/S II: +10 HP/ +15 HP (2010 Boxster: 255 HP; Boxster S: 310 HP) • Improved performance (driving dynamics, laptimes, fun to drive): - increased power and torque: new DFI technology for S-model - faster acceleration and take-off: • PDK 7-speed with new steering wheel, shifts faster than manual gearbox • Launch Control, with Sport Chrono package in conjunction with PDK - improved driving dynamics/lap times: axle-differential-lock, • PDK, PASM and 19" wheels • Reduced fuel consumption: -2% - 14% (with DFI Engine + PDK) vs. Cayman I • Improved standard equipment: 6-speed MT, CDR 30, PSM+, drive-off assistant • Light Innovation - New double tube headlights - LED front position lights, - Bi-Xenon headlights incl. dynamic cornering lights and LED daytime running lights (option) • Interior Change - New CDR 30 with 5 inch screen - New PCM 3.0 touchscreen (option) - Air ventilated seats (option) - New PDK steering wheel • Style Change - Front and rear end - Mirrors - Exhaust pipes - Wheels 17" / 18 "/ 19" • Light Innovation II - LED taillights - LED brake lights - LED rear fog light • Chassis Innovation - Revised chassis setup - Rear axle-differential-lock (option) - Brake assistant - Larger brake disc/caliper front • Improved dynamics • Powertrain Innovation - New DFI-engine generation for 3.4 l - New VC+ 2.9 l engine - New 7-speed PDK (option) • Improved fuel efficiency

[via Cayman Club] Thanks for the tip, Ken!