I heard the 3UR engine has independent VVTi. Each bank has their own VVTi control which will be very hard for any standalone to control.
Yes, all 4 cams, both intake and both exhaust have vvti where-as the 1st vvti systems on the 1uzfe had it only on the exhaust. It works by rotating the cam(s) in relation to each other and to the piston timing.
Now the Toyota 2ZZ-GE used in the Lotus Elise with 190hp used the VVTL-i system which uses a system very similar to the Honda Vtec which has a hydraulic activated high RPM follower. This changes lift, duration and timing by switching total cam profile between a low RPM and high RPM profile.
The result is 190hp from 1.8 liters = 105.5hp/liter... or...
the same output on the 1uz at 4 liters = 422hp
in the new 1ur found in the LS460 = 485hp
in the 2ur found in the IS-F = 527hp