Last night, while I was about to cancel my #2 RasPi order, RS wrote me:
"If you ordered a Raspberry Pi board as part of your order we are pleased
to inform you that we have sent you the upgraded 512MB Revision 2 board
to thank you for your continued patience."
That's a pleasant surprise, especially if this means I can run GCompris and Childsplay on it without noticeable slow downs.