Quick update on my previous post - the US price of the new HD Pentax-D FA 645 35mm f/3.5 AL IF lens will be $1,096.95 $1,599. The lens is now available for pre-order. Shipping should start in mid December 2015.
Update #1: the new version is basically $500 cheaper than the old model.
Update #2: the price of the new lens is now changed to $1,599.