Incidently the T3i & T4i will both auto focus in video mode with the new 40MMM AST lens Both cameras will also use the Radio Mode of the 600 EX RT flashes, and am i the only shooter to have purchased a Firewire card reader for CF SDHC THOSE DUMB SONY CARDS ETC>>> i have never talked to anyone else that owns one??
1. T3i will af in video / live view mode with 40mm STM, as will every canon dslr with live view and video.
T4i has improved af thanks to phase detection and contrast af points also on sensor. Stick. Wrong end. Have. You.
2. T3i compatable with radio flashguns? Not in menu. No firmware upgrade. Are you a liar?
If not knowingly a liar then it seems you are quite gullable, as...
3. Yes. Only you.