I was driving on the highway, suddenly there was a bang from my front end. And I noticed a burning smell and some smoke. I pulled over and there was some white steam coming out of the engine bay. I pulled over and shut the car immediately. The engine was stilling running fine when I shut it off. I noticed something was leaking, but the leaking stopped after shutting off. I don't think I hit anything, and no major parts or metal particles came off.
Unfortunately, I didn't find out what kind of fluid that was leaking... I couldn't tell if it was coolant or oil. I checked the oil dipstick an hour later and the oil level was still normal. The car was towed to the mechanic's shop. But the shop has a full schedule until Nov.26th... Any ideas? Some told me it was blown freeze plugs, some said it was blown engine and some said it was a bad oil pan. Thoughts?

It's hard to tell, but it looks too watery to be oil. If it is coolant, and it's running down the starter like it seems, a burst freeze plug seems likely. It can happen.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

Thanks a lot.