CentOS Linux 7.4, based on Redhat Enterprise Linux 7.4, has been released for x86_64, AArch64/ARM64, armhfp, ppc64, and ppc64le architectures. Below the release announcements:

Release for CentOS Linux 7 (1708) on x86_64
Release for CentOS 7.4.1708 for AArch64/ARM64
Release for CentOS Linux 7 (1708) on armhfp
Release for CentOS Linux 7 (1708) on ppc64
Release for CentOS Linux 7 (1708) on ppc64le

 CentOS Linux 7.4 (1708) released