You probably have an /etc/issue.rpmnew file. [by TrevorH]
I don't believe it does get overwritten - it should be marked as a config file in the rpm spec file so if you have modified it, the new install should create a /etc/php.ini.rpmnew file [by TrevorH]
I'm currently testing installing a RPM with a config file using the config(noreplace) directive.
As per using config(noreplace) my spec file marks a single file as a config file:
I did an on disk modification to the file for version 1 and proceeded to upgrade to version 2.