Read that aforelinked article if you need a good PR laugh, but as it pertains to Catalyst 14.2 for Linux, I was told, apparently there isn’t a 14.2beta for linux because [with the recent open-source driver features and] all those changes have already been published." While AMD's communication crew went to talk up Catalyst 14.2 for Windows due to its proper support for the Thief game and that Thief will soon sport a Mantle renderer. The Thief game and Mantle itself are both irrelevant to Linux gamers at this stage since there's no Mantle Linux graphics driver and this game is not natively available for Linux users at this time.
While no Catalyst 14.2 Beta for Linux was anticipated, a driver did in fact end up being released on Tuesday. The changes appear scarce and just officiall correct a Minecraft and X-Plane issue. The fglrx branch version is still in the 13.35 stream. Those wanting to download this lackluster AMD Catalyst Linux graphics driver update can find the x86/x86_64 Linux driver download link from this forum thread. It's too bad there's no official reports of fixing the poor Radeon R9 290 "Hawaii" Linux performance.