For kernel 3.19+ a new firmware version is recommended/required. I already successfully tested with gentoo-sources-3.19.3. With the older firmware I was not able to use the Intel Wireless-AC 7265 with the 3.19.3 kernel. Adding a new slotted version would be desirable. Reproducible: Always
Fixed with https://github.com/gentoo/gentoo-portage-rsync-mirror/pull/78
Closing, as iwl7625-ucode is masked now.