well I've just had an interesting convo with my RN pilot mate - he also used to work for Lockheed Martin, so knows a lot about it and tries to keep up with the latest news re JSF
in short, he believes that the RN will definitely get JSF, as will the RAF. he also says that the variant that the RN want will ultimately out-perform Typhoon in terms of weapons' systems and versatility, resulting in the RN effectively 'end up with' a far more powerful strike force than the RAF!
this is based though on the fact that RN want the JSF variant
without the lift fan, which has better performance than the one
with - aka the variant that the RAF prefer, which is more of a Harrier replacement. the RN have already determined that they don't need the STOVL capability, and therefore their variant will be more of a conventional a/c operating from the new larger QE2-class carrier.
all this depends on however is whether Whitehall will actually allow the RN and RAF to effectively operate two completely different aircraft; the likelihood is that the RAF will 'win' and ALL British JSF's will be the variant with the lift fan, purely for commonality (and therefore cost) purposes - which the RN don't want!
as far as Typhoon goes, yes apparently an extremely capable a/c, but still with teething problems. whether those problems will be ironed-out to the extent that they would match what JSF promises, by the time the latter's in service, is another matter - but by that point, JSF will already be entering service anyway!
various other issues too - the capability of the carriers has yet to be determined for obvious reasons. as it stands, both the QE2 carrier itself, and the PoW will but have ski-jump decks (like the current Invincible class) predominantly for the benefit of operating the lift-fan-less JSF!
all very interesting - particularly in that my mate is not the world's biggest Typhoon fan!
sm