The new model Ms are all .32 Cal and seem to be selling for between $1200.00 and $1500.00, if you can find one, as they are scarce right now. Awful spendy for a pocket pistol.
Evidently they are not made to original specs. A fellow on the Colt forum bought one and found the barrel would not fit in an original nor would the original barrel fit in the new one. You can buy a pretty nice old one for less than the new one. here is a pic of one of mine along with a Savage.*Assuming* (yeah, I know, that evil word) the new ones are faithfully made to original spec, if the reports I've read are right it's not that difficult to up-gun a 1903 to a .380 if you can get the 1908 top-half parts and magazine for the bigger caliber.
*Big* assumption, though.