I've just contacted Orange to discuss my impending upgrade to the S3 from my current S2 only to hear that they are delaying the release of their S3 by 7-10 days so that they can perform QC checks.
They plan to check a random number of handsets for faults before releasing their supplies to their stores and online shop.
They told me this is due to a large number of customer returns on a recently released Blackbury piece of crap that had ill-fitting back plates. They apparantly had 2000-3000 customer returns in the first month alone.
I find it beggars belief that Orange would shoot themselves in the foot in such a manner. After contacting Vodafone, O2 and Phones4U they all say that they will definately be releasing their supplies of the S3 on May 30th with NO DELAYS.
So if you were planning to upgrade to the S3 through Orange then be warned - you may hae to wait a while. Personally, I think I'll go for a SIM-free upgrade through Phones4U.