In compliance with a International Atomic Energy Agency (IAEA) requirement, Iran revealed the existence of the new plant this month and has agreed to allow U.N. inspectors access to it. While the British report states that "diplomatic sources said it could hold 3,000 centrifuges, capable of making enough enriched uranium to build a nuclear bomb each year," the IAEA reports that nuclear material has not yet been added. The IAEA says that the data they have been given suggests that as with the existing Nanatz facility, the new site is only designed to enrich uranium to 5%, useful for energy production at the nation's Bushehr power plant but not for military purposes. See: http://news.antiwar.com/2009/09/25/as-required-iran-informs-iaea-about-new-enrichment-site/.
The most direct route for the Israeli air force to attack Iran would be over Iraq, but Israeli F-15I and F-16I jets would still be well-within range of Iran after flying over Saudi air space. Such a move may also circumvent some political pressure from the U.S.