They haven't put out a release date on the FS models yet. They've started shipping the 40sw compact guns and conversion kits for 9mm and .40. They're supposed to have most models and conversion kits available by the end of december/mid january. This is all word of mouth rumors, though.

I'm going back to New England in March, I might have to make a trip to the Sig Factory, I'm intrested in the fullsize .40 as well.

I bought a full size p250 .40 caliber a couple of days ago and finally I got to the range today and boy was that a sweet shot. I only fired 70 rounds through it but let me tell you, I'm a happy camper. Mine was manufactured in December 2010 and probably all the bugs that this model originally came with were taken care of, but it is and most importantly, it feels like a sig. I used to own a beretta 92fs (9mm)and even though is not polycarbonate and surely is a great and accurate gun, the recoil was much stronger on that one than on this one, being a .40 caliber.
Field stripping this gun is just super easy, and the fact that you can exchange calibers is just a plus. For $389 including shipping, it makes it even better.
When started shooting, I noticed the a little pull downwards, but it was actually me getting used to the DOA trigger (much better and smoother than my .38 Taurus 2" revolver) and any other double action handgun I've shot before, but after ten rounds, and at forty ft. from the target, the grouping was outstanding.
I was using "blazer" ammo and it ate 'em all.!
Hope to come back here with more good news very soon....

Important note...This is not a top of the line sig but it's much more that you'd expect for the money and as good as you'd expect from Sig Sauer.

Blessings!