Well went into the Westfield stratford Sammy store, they have no blue ones as its been mentioned earlier...the guy said about 2-3 weeks hopefully they will have the blue ones in stock.
£549 sim free and they had a few white ones on display. Sorry but the white just isnt that good looking, the led looks absolute rubbish, not very bright and looks washed out in all honesty...i dont know if it will be the same on the blue version but honestly i wasnt that impressed with the white one. Id go as far to say thet One X's led is much more brighter but maybe i didnt look hard enough ie if there is a brightness setting for the led notification light. From the handset i was looking at, it seems like the led is behind the white casing of the phone so it does shine through but like i said is hardly bright and looks very washed out.
Not interested in the white one at all, so ill wait for the blue one to be released...no real hurry as ive got my One X to keep me company for time being till i sell it. But i do like the software implementation on the S3, to me its definitely better optimised than Sense on the One X.