I'm thinking it's probably because the car is still "new" on the market and we'll start seeing things around 2013... and by the time Ford changes the body style; there will be a million Projector/Halo/LED headlights for the "2012-2013" Focus on Ebay , we've seen it happen time and over...
Here's a good example, we picked up a 2013 Hyundai Elantra for my wife about a month ago... since that "new" body style actually began in 2011, they already started making Projector/LED Headlamps for them... for a LOT less than $4000 a pair..... take the below examples:
Even good old Sentra/200SX get the love!!! (LOL)
Personally, I've been thinking about snatching that Morimoto H1 kit and retrofit it into my current housings; but I also don't wanna find out a week later that "Ebay" started selling those factory made ones for $550 -