The Lexus IS F will only be officially sold in Japan (where it went on sale on 25 December 2007), United States & Canada (going on sale early March 2008), Europe (April 2008 or slightly later, depending on the country) and Australia (summer 2008).
Keep in mind that Lexus sells the IS, GS and LS models
without direct injection in the Middle East countries. It seems that Lexus has decided NOT to develop an IS F without direct injection for the Middle East, Brunei and China. For more information, check this article and read the comments that follow it:
http://my.is/forums/f41/2nd-generation-lexus-is300-far-east-middle-east-306734/
In other words, I'd strongly suggest consulting the Lexus distributor or a dealer in Dubai or in neighbouring Kuwait, Oman, Saudi Arabia or the United Arab Emirates about any issues the IS F might have with its direct and port injection system and the cleanliness/purity of the gasoline in the Middle East. This link should help you locate them:
TOYOTA: Worldwide