https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.2_release_notes/index.html
https://wiki.centos.org/manuals/releasenotes/centos7
http://planet.centos.org/
http://seven.centos.org/
主要的change
更新了一些驅動，btrfs進入preview，越來越成熟了。
this section is to be reviewed:
since release 1503 (abrt>= 2.1.11-19.el7.centos.0.1) centos-7 can report bugs directly to bugs.centos.org. you can find information about that feature at this page
sudo is now capable of verifying command checksums
a kerberos https proxy is now available for identity management
nss no longer accepts dh key parameters < 768 nor rsa/dsa certificates with key sizes < 1024 bits, nss also now enables tls1.1/1.2 by default
various packages now support tls1.1/1.2 and ec ciphers
the maximum number of scsi luns has been increased
the virt-v2v command line tool is now fully supported
dd can now show transfer progress
openjdk7 now supports ecc for tls connections
tpm version 2.0 driver level support has been added
tcpdump now supports nanosecond timestamps
various updates to the networking stack (i.e. vxlans, data center tcp, tcp/ip stack, ipsec, ...)
various atomic related packages have been updated
update to the libata, fcoe and dcb storage drivers
updates to various storage, network and graphics drivers
anaconda now supports nfs when adding additional repos during install
major rebases for the following: gnome from 3.8 to 3.14, kde from 4.3 to 4.14, xorg-x11-server from 1.15 to 1.17, libreoffice from 4.2.8 to 4.3.7. openldap from 2.4.39 to 2.4.40 and more.
because of these rebases some 3rd party repositories (like epel, elrepo, nux!, etc.) may not have all their packages rebuilt to use the newer packages in this release. this may cause the inability to update to the new release until those repositories fix their dependencies. you should contact the 3rd party repository owner to get problems fixed, or remove problem packages from 3rd party repositories to complete the update to this release.
technology preview: support of the btrfs file system, overlayfs, dnssec, kpatch, virt-p2v tool and the cisco vic kernel driver
more information can be found at https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.2_release_notes/index.html.