The new Caldina is derived from the Avensis platform, with the same 2700mm wheelbase. However, if we consider only the hottest model Caldina GT-4 - the most interesting model to me, we can find it owes very much to the last generation Caldina GT-T. Basically, the engine and 4-wheel-drive system are carried over from the old car, which in turn took the mechanicals from the mighty Celica GT-4. 

The engine is a 1998cc 16V Turbo, pumping out 260hp and 239lbft, unchanged from the old car. The 4WD system employs viscous coupling to distribute power between front and rear axle, in addition to a Torsen limited-slip differential between the rear wheels. Again, this is the same as the old Caldina and Celica GT-4. Transmission remains just a 4-speed automatic, although it gets manual shift pattern.  

However, compare with the old car there are still a lot of new items. Most notably is the sharper and handsomer new look, the much higher quality interior and the introduction of double-wishbone rear suspensions from the current Celica. 

Lesser models are powered by a 152hp 2-litre 16V engine (which has no relationship with the turbo engine) with direct injection, or a 132hp 1.8-litre 16V engine, both with VVT-i. The 1.8 unit is for FWD only.