ok, since I realize a bunch of guys probably have no idea what I'm talking about, there are a lot of internet threads covering the switch to titanium firing pins and overpower firing pin springs to pass the California drop tests - Cali is a big market for 1911 producers so there is a lot of effort put into selling guns there legally.
Have a look here:
http://forums.1911forum.com/showthread.php?t=262031
And here's the "new series 70" titanium pin available as a Colt OEM part (Colt part #: SP57984):
http://www.midwayusa.com/product/118264/colt-firing-pin-1911-45-acp-series-70-80-titanium
And more discussion here:
http://thefiringline.com/forums/showthread.php?t=352222
To summarize:
Most (if not all) 1911's sold in the USA today have only one version, not a california version and a version for everyone else. Colt makes both "new series 70" and Series 80 guns today. One has a plunger that physically blocks the pin except when the trigger is pulled, the other uses a very lightweight firing pin and a heavier spring to prevent hte pin developing enough inertia to fire the gun if dropped.
Both systems seem to be reliable, but the new series 70 has a better reputation for trigger pull and is closer to a GI 1911 design.
I have not been able to determine if the new series 70 guns have a collet bushing like the pre-series 80 S70 guns did. I'm sure someone here will confirm.
I know Springfield Armory Inc. uses the titanium pin system - a few sources I found claim they invented it. Colt definitely does too - all current mfgr guns ship with the titanium pins, even the series 80 for parts commonality reasons. I *believe* the STI guns also use this Ti pin system.
At the end of the day though, I think this auto-ordnance pistol will function and look close enough to my WW2 1911A1s to fill the role - provided the gun meets expectations. When it arrives, I'll write up a review with pics to compare to the real deal WW2 1911A1.