Keith ... I'm currently running a 3.10 kernel on Centos6, but I keep running into udev issues. What I found was the sysfs has changed significantly enough from 2.6.32 to 3.10 that SUBSYSTEM references in udev rules no longer resolve properly. For home use, this may not be too noticeable, but our application relies heavily on udev.
For my needs to be met, I'm going to need a 32bit enterprise linux 7 derivative ... CentOS or otherwise. Rather than just hope it will happen eventually, I'm trying to get involved. There were some good pointers on things that need done already mentioned, and come mid-august I'm going to be devoting a fair amount of time to these. If you guys all have other solutions that work for you instead of a 32 bit EL7, that's great. My project needs EL7 32 though, so that means I'm making something work one way or another. Just figured there were others in the community that had similar needs.