Sig Sauer's Jeff Creamer mentioned on SigForum that US made SIG P225s will be available in July or August. It will have stainless slide/ aluminum frame, but there will be all stainless version later on.
The new P225 will have the same contour as the older one, but the trigger guard shape will mirror the P228.
P228 and P225 have very similar dimension so I don't think there will be difficulty in finding holsters.
From: SIG Forum