DigiTimes reports that Nvidia may be experiencing some problems with the current GTX 10 GPU overstock and might postpone the launch of the GTX 11 family for a few months, despite already being in possession of around one million next gen GPU cards. This could mean that the custom-made AIB and mobility versions could launch almost at the same time as the Founders' editions.
https://www.notebookcheck.net/Nvidia-ready-to-ship-over-one-million-GTX-11-series-cards.315298.0.html