I recently became aware that this is being worked on as of recently. A similar thing already exists, though. Those interested in an ARM port may also be interested in taking a look at RedSleeve Linux, which is an ARM port of the same upstream distribution as CentOS.
You can look here for more info:
In total 109 SRPMs had to be modified in order to get them to build and work on ARM. They are in SRPMS/changed directory on the RedSleeve mirror. (Note: About 5 of those 109 were changed in order to remove the upstream branding which isn't relevant to the CentOS effort as it is already taken care of. It is quite well known what those are.)
I hope this is of interest to the CentOS ARM port efforts. Or, you could take RedSleeve for a spin, since that is already available.