The Dubai infrastructure planning did at one time include a Metro line to the new DWC airport. But I recall it was intended to be mainly underground - and even if it's ever built that would not fit the definition of a high speed link.
DWC is a fair distance from the centre of Dubai (however you define that - it's now a linear development all the way from Jebel Ali to Sharjah?) but it is roughly central between the existing DXB and AUH airports. Logically it could probably replace both - but there is nothing united about the UAE. Isn't going to happen. Meantime shed loads of money is being invested in expansion of both.
Last edited by Dubaian; 30th Jul 2013 at 09:51.
Reason: typo fixed