Basic F3 Support Not Working

The release notes state that there is basic F3 support in the Windows 10 edition only. However, pressing F3 does absolutely nothing. I have tried with both a current world and generating a new world with the same results.

Addition by [Mojang] Mega_Spud (Jay Wells):
It looks like the mentioned F3 support won't be included in this update. Here's the statement from Mojang: