They might just be recommending people to upgrade to the latest firmware while they can. The fact that they're recommending that people using 4.x firmware stay on that firmware would suggest that the support for higher firmwares is more limited. And it's just too big of a coincidence that they make a major breakthrough within days of Sky3DS being released.
But lets wait and see.
Actually, GW has been hinting at this for a couple of months now. They have repeatedly mentiond "something up our sleeves" and "big guns". Maybe I'm just naive or an optomist? I believe they had this already planned. Either way, it certainly cements their position as top dog in the realm of the 3DS. So very glad I chose them as my 3DS solution.