What is the difference between a Camry and Camry LE?

The Camry LE had more options. It was just a different trim.

What "luxury edition" including heated leather seats, the deluxe edition with improved sound and so forth?

Well... maybe the newer ones but certainly not the older ones. The older LE's were pretty average... A few more power options but leather was still an option.

On the entry level "CE", features included: 16-inch wheels, air conditioning, power windows and mirrors, cruise control, and a six-speaker audio system with CD player and auxiliary input. Keyless entry and an eight-way power driver seat were added to the "LE" trim, with the "SE" gaining a firmer suspension tune, 17-inch alloy wheels, blue-tinged Optitron gauge illumination, and sports-oriented interior and exterior trim modifications. The top-level "XLE" builds on the "LE" specification, with a six-CD JBL sound system rated at 440-watts, with integrated Bluetooth technology. Other "XLE" upgrades comprise a sunroof, automatic dual-zone climate control air conditioning with air filter, satellite navigation, wood grain highlights, and reclining rear seats