Oracle Linux 7 update 5 is in the works... and in order to give users a free sneak preview of what's coming we put a preview release out on OTN. We typically haven't done this in the past and just always released new update versions as they become generally available but some users like to try things out early on.
[disclaimer] This is a preview - do not use production - [/disclaimer] ...
If you run into issues, do let us know, so we can make sure they are addressed before the GA release.
You can download it from OTN here.