To all those concerned,
I have read that FreeBSD would be supported by the latest graphic card drivers, which was also confirmed by email@example.com.
I am posting here as recommended by firstname.lastname@example.org from my original posting here... AMD Support and Game Forums - FreeBSD driver support for Radeon R9 290X
Any further information on this (e.g. download URL for beta driver in development) would be much appreciated.