Update: Mobily has fixed their iPhone page to correctly display iPhone 3GS. “The wait is over, and the fastest, most powerful iPhone yet is now available to pre-order exclusively from Mobily. Book your iPhone 3GS now to ensure being the first to recieve it on launch day.”
Mobily’s iPhone page got updated today, now it doesn’t even mention the iPhone 3GS but instead it adds a form for ordering the iPhone.
The website now includes the following: “Now officially in Saudi Arabia. Be the first to get it from Mobily, the only official provider with full support from Apple”. This is the same form used back in February when the iPhone 3G was released. I guess Mobily was lazy.