The 70LE632, 732, 733, 734, 735 are all 2011 models. These are all Full-Array LED. The 632 does not have a Quattron panel. All the 73X models do. The 732 is 120Hz, and while I'm not sure about the 733 and 734 (they are warehouse store variants of the 732) I think they had Aquomotion 240 (120Hz + backlight strobing) and Quad Pixel Plus. The 735 is 3D.
The LE640 is the 2012 replacement for the 632. Wi-Fi, No Quattron Panel, Apps are now called "Smart Central." Redesigned frame that is thinner and partially brushed metal. The LE745 adds in 3D and a Web browser. The 845 is 240Hz with a Quattron Panel and 3D. All 2012 70-inchers are edge-lit.
ht Panasonic TC-P60ZT60, Monitor Audio: Silver RX6, RX Centre, Radius 90HD; Martinlogan Dynamo 700, Marantz SR5006, PS3, Oppo BDP-103D
2ch Marantz PM8004, Sony BDP-S1000ES, JVC T-X3 tuner, Monitor Audio Silver RX1, REL T3, Apple TV, Peachtree Audio DAC•iT
lr Panasonic 50ST60, Sony BDP-S5100