For the V8 engine: yes the scheduled replacement on that is 90,000 miles. I am at 86,000 miles now.
I plan on changing the following at 100,000 miles
Timing Belt pn# 1356809070 = $ 39.25
Water Pump pn# 161005927583 = $ 98.27
Timing belt tensioner pn# 1354050030 = $ 37.77
Thermostat pn# 9091603100 = $ 12.52
So for $ 200 I get the above if I do the work myself or if the dealer does it then you are looking at prices from $ 700 to $ 1,000 (it depends on what you have them replace)