NYSE Euronext, the operator of the New York Stock Exchange, and Germany’s Deutsche Borse formally announced their $10 billion all-stock merger on Tuesday. And the fee engines of seven law firms already have started on a deal expected to close before the end of 2011.

Writing for The Wall Street Journal‘s Deal Journal last week, retired Skadden, Arps, Slate, Meagher & Flom M&A partner Ronald Barusch noted the expected regulatory hurdles will likely have legions of lawyers billing around the clock in different jurisdictions in order to ensure the transaction receives the necessary regulatory approvals. Now the full legal teams are starting to take shape.