Just got off the phone with Sig and they wanted to confirm my warranty registration and they also wanted to see if I wanted to place an order for one of the upgrade conversions due to the lack of avaliability currently. they were offering them for 20% off the normal price and free shipping. I put in my order for the .40 and its going to run $300 even. The guy I spoke with also said that the .357 sig would be coming out soon too and if you already have the .40 all you need to upgrade to that is just a barrel. so some cool intresting info I though I'd share with you guys.
The .45 kit is also coming out soon, but its not going to be avaliable till the summer sometime.