Why shorten the barrel for less accuracy while keeping the grip full size? Doesn't seem to do much for concealment
But, it does look good.
My thought is that this is the replacement for the 4" "Service" model not the "Sub-Compact".
I think that if we're patient then there will be a "SC" soon.
The 4.5" barrel of the XDm is too long for me for appendix carry (the way I carry). The 4" XD is a hair too long, but I make due. I can't say whether 3.8" will make a difference.