Once they are added to the Production list, of course.
Seriously, though, I've been waiting over a year for this. I've wanted to try the internal overtravel stop, but couldn't use it on my Allround because of the intermediate trigger profile.
Ouch, that magwell grip will keep it from being on the production list, but does the 226 have it? From the SIG Legion site it really only looks like the 229 has grips that extend down past the frame. Here's hoping, I have my 226 with the intermediate trigger and SRT that I would love to use, and I would also pull that reduced slide stop lever over as well.