Hi guys, I'm a Brit in the UK, but frequent visitor to Houston and I can tell you that it's the UK that get shafted...the car manufacturers don't call it "Treasure Island" without due cause .
It looks like the 'SR' is just an option that's available with the GFX bodykit, as everything else mentioned in the article is available here already, and the 204 bhp is stock for the gas powered models (the 220D oil burner has a slightly lower output).
For your information I paid the equivalent of $66,000 for my full spec IS250 and then purchased the GFX kit (SMG) from Westside Lexus in Houston and hand carried it back to the UK...for the reason that the GFX kit was not then available in the UK. It is now, but only in primer coat so you pay a fortune for the parts and then have to pay extra to get them painted :( .
...and to answer the last question, the price of the IS-F in the UK is the equivalent of $103,000
believe me I prefer to be a petrolhead (gearhead) in the USA
:o 66K for a IS250? and 100K for an ISF? That's insane!! Not to rub it in, but I just started liking my IS 350 even more now! ;)