There is no evidence that Satoshi owns 1.1 million bitcoin. There's only flawed speculation.

At once? Absolutely nothing. $68 billion would swap from banking accounts, and that might terrify some. But, if a sell order of 1.1M bitcoin was accepted at once, then it'd have no influence to the price. The price would drop if these million bitcoins were spread across many sell orders, at lower prices than the current.