Perhaps this is a remarkable bit of prescience by the Admiralty. By the time the carriers are launched (ie the projected date of 2012, plus six years of the usual fannying around), Her Majesty might (may God strike me down) no longer be Her Majesty. Surely there will be a public clamour for a fitting memorial. Enter HMS Queen Elizabeth.
Continuing this hypothesis, The Prince of Wales will be a certain pop (albeit 30-something) pin-up, rather than his hapless father (the latter's role being restricted to basking in reflected glory, by launching both vessels).
Well, it's about as near the money as the bollox in The Times.