As for the next gen LC and when we could see it, here is a guess..
If you exclude the 50 series , each new big LC was launched approximately 9 years after its predecessor ( In Japan ) ( 60 - 80 - 100 - 200 )
looks about right to me, funny thing is the final desigh on the 300 has more than likely already been approved... the 100 series development began in 1992 and was approved in mid 1994, so yah, I'm guessing the 300 is well under way, we'll proly see something in the next couple years...
I remember we saw spy shots of a 200 test mule in early '06..it looked like it had the sides of a 200, front end of a GX470 and rear of a 06/07 100...
Around September '06 the first pictures of the final version of the LC were released..
I think the final design was approved in 2004 .
The test vehicle from 06 actually had crawl control, rear + center diff lock and AHC .
I have never seen a 200 that combined all these options together.. ( i prefer mechanical KDSS over electronic AHC and electronic KDSS )
The full option PRADO 150 does come with all these options ( AHC ( only for the rear ) + electronic KDSS / REAR + CENTER DIFFLOCKS AND CRAWL )