560 support has held. Next supports would be 520 and 480. Outlook is biased bullish unless 600 is rejected again. (My excessively precise buy point is 599.17.) Magic monkey is not impressed, however. I don't expect much adrenaline to flow this week in bitcoin.
I know of no ETPs other than those announced and filed in the U.S., but if history is any guide, I would expect one to list in London in 16 months or less. The Winklevoss fund would suffice, I think. Flash smash 50k in a clock time on the order of milliseconds would be conceivable, were it not for circuit breakers. Infrastructure there is amazing.