Is the case that the new facility is for weapons development a US fabrication? In the article below Iran is said to be turning the facility supervision over to the UN watchdogs. Why would they do this if they want to enrich to high levels? Also, the facility won't be operational for two years. So their announcement is well withing the six month requirement. I would tend to believe Iran in this case, that it's a backup for Natanz.

http://english.aljazeera.net/news/asia/2009/09/2009926155247458351.html

News CENTRAL/S. ASIA
Iran hands IAEA plant supervision

Ahmadinejad said he thought he would be encouraged for notifying the UN early about the plant [AFP]

Iran will put its newly disclosed uranium enrichment plant under the supervision of the United Nations' nuclear watchdog, the country's vice president has said.

"This site will be under the supervision of the IAEA [International Atomic Energy Agency] and will have a maximum of five per cent [uranium] enrichment capacity," Ali Akbar Salehi, the Iranian vice president, said on state television on Saturday.

The announcement came as Barack Obama, the US president, led a global outcry against Iran for building the facility.

The plant, which is "not an industrial-scale" unit, will be operational in two years' time, Salehi said.