It is beyond my understanding, why Nokia and now Microsoft, insist on making 100 regional variants of the same hardware, when they could just use simple if/then/else logic in the code using things like GPS location and the identity of the carrier from the SIM card to set the default language and other settings. It would be a whole lot simpler for everyone if there was exactly one firmware for a given hardware device. (hint, this is exactly what Apple has been doing since the first iPhone)
Regardless, if you get too impatient, you can always flash yours to a different regional variant which is already up to date. There's an easy to follow guide here: http://forums.windowscentral.com/microsoft-lumia-950-xl/411084-tired-waiting-your-950-950xl-firmware-update-you-can-get-now.html
I wrote that guide and verified it with my own device, but of course the risk is yours if you decide to try.