A1bill,
What a strange set of questions. Before getting to that, not everyone here that takes an interest in F-35 and questions various aspects of it or its programme is a "naysayer" thank you very much.
As for future UK buy, you seem to know more than the UK Government does about it at the moment. Well done. The rest of us will have to wait a few years to see what the plan will be.
Tornado - no reason to change the current OSD. Why would you imagine there would be?
Typhoon - when F-35 is ready to replace OR at lifex OR when further spending cuts are announced. Future buy as planned already, excepting future pilotics.
F-35A - why would that change again?
Gen 6 - you might as well be asking about Gen 7.
Australia - can buy their own F-35s. Apart from anything else, why would they want to buy second hand, early frames with limited capability when all the procurement plans were based on LM glossy brochures and the capabilities proffered theriein?
Perhaps you need to take the sketchy SDSR outline plan for what it is. The detail will slowly fill in over the next few years on the equipment front. One of the main drivers to the future is not the hardware, but the manning - some things will have to go in order to man the new stuff - RAF and RN numbers are only going up by 700 and that's got to man a couple of big boats too!