I am interested in the new video too. I am curious to see how BitXYZ will track the price of actual XYZ in a free-market based solution rather than any centralized price controlling mechanism. I also don't think I fully got how dividends will be paid and the relationship between BitAssets and BitShares is a bit hazy. I am still reading your document though.
p.s. see you on October 5th in cryptocurrencycon in Atlanta!
BitAssets track USD price like prediction markets track election outcome probabilities... with the primary difference being the market has much better information and as a result it will be an order of magnitude more accurate.
It is all about betting on which way the 'consensus' will move where the only logical bet is that it will follow USD and thus it will follow USD. Once a market establishes a consensus it is very hard to budge that expectation because it requires the majority of the market to change their mind at once.
Dividends are 'paid' when you transfer your money based upon the coinage and the amount of money. (they are not paid as a million micro transactions).
BitShare ~= Bitcoin
BitUSD = Collateralized Promise to buy back a BitUSD with BitShares at a future market price. Collateral starts out at 2X USD value worth of BitShares.
Miners enforce the promise when Collateral falls to 1.5 x current price.
Current price equals the highest unaccepted bid in the order book.