NYSE-Euronext Marriage

New York Stock Exchange has agreed to buy Euronext for $10bn, creating a market with capitalization of about $20bn. Looks like the American HQ will be in New York, with offices in Paris and Amsterdam, as well as a derivatives business in London. How much will it cut the cost for users of the combined exchange ? What's next in the consolidation of the global exchange market - LSE and NASDAQ ? Article From Finextra, and from Marketwatch.com