You can watch it live *now*
once they fixed the stream...
Phoronix: AMD Announces The Radeon R9 290X
AMD announced today the Radeon R9 290X graphics card as their new ultra high-end product...
Right now AMD is showing the nextgen Radeon GPUs live at their event.
Word is going around that they will announce drastically improved AMD Linux drivers later during the event. That would be within the next hour or so.
Watched that stream from about 23:10 CET to the end, no mentioning of Linux or Linux gaming at all, instead great emphasize on DirectX 11.
I would call that fail, AMD.