I cant find any confirmation anywhere. Does anyone know?
If it is not supported, is support planned?
As you can find on wikipedia Apt-X is a "family of proprietary audio codecs". That's another way of saying they want money for it. While open source is good in many things, it's a legal problem to circumvent Apt-X patents and implement it without paying.
Hence, at present Apt-X support on Linux is very unlikely, at least as long it is not as widely spread as say mp3...