The new version of glibc removes support for NIS and NIS+. The default `/etc/nsswitch.conf` file provided by `filesystem` package already reflects this change. Please make sure to merge pacnew file if it exists prior to upgrade.
NIS functionality can still be enabled by installing `libnss_nis` package. There is no replacement for NIS+ in the official repositories.
`pam 1.3.0-2` no longer ships pam_unix2 module and `pam_unix_*.so` compatibility symlinks. Before upgrading, review PAM configuration files in the `/etc/pam.d` directory and replace removed modules with `pam_unix.so`. Users of pam_unix2 should also reset their passwords after such change. Defaults provided by `pambase` package do not need any modifications.