Sony will have 32GB card later this year. I think I saw September. I believe there will be a firmware update in July or August that will allow the use of 3rd party cards. I'm hearing this from various NAB reports.
we've been using an 8gig Sandisk with no problems.
If you look at the card the ONLY difference is the self-adhesive label. Even the serial numbers follow the same format, and the colours of the metal and plastic are exactly the same.
its 99% likely they are made in the same factory.. Unless the USA camera is different which i don't believe it is, then I doubt very much if there's coding in the Sony SxS card that tells the camera its a Sony and not a Sandisk card.