Was checking out Toyota's Japanese website and stumbled upon this. Can't read Japanese well but it looks like HID is being debuted as an option for the Ist this year:

http://toyota.jp/Showroom/Updates/ist/hidselection2/index.html

and specs:

http://www.toyota.co.jp/jp/news/04/Aug/nt04_040.html

I wonder if they will bring it over. and how much it would be to import