Turns out Sig is revamping their whole lineup this year. Coming from both Erhardt and my Sig rep, this is pretty reliable.

Everything's going to have a rail except the P239.
Production will cease completely on the P225, P210, Trailside and even the P228. There's a nickel-slide GOM available, and that's the last of them.
Next year will introduce a single-action P220R and the P240, which is a P245 slide on a P220 frame (think Commander P220)
All new GSRs will be the Revolution platform, as Sig has moved all manufacture to in-house facilities.

Very sad news to see so many …