The complete Wikimedia Foundation blog post has more info and analysis.
Here’s the list itself:
Top 10 Most Edited Pages on English-language Wikipedia in 2014
1. Deaths in 2014 (19,789 edits)
2. Malaysia Airlines Flight 370 (10,217)
3. Japanese dissidence during the Shōwa period (8,212)
4. Ebola virus epidemic in West Africa (7,794)
5. Islamic State of Iraq and the Levant (7,520)
6. 2014 Israel–Gaza conflict (6,497)
7. Shooting of Michael Brown (5,835)
8. Malaysia Airlines Flight 17 (5,185)
9. 2014 Pacific typhoon season (5,012)
10. List of works by Eugène Guillaume (4,311)
Also, as suggested in the Wikimedia blog post, if you’re interested in how Wikipedia handled breaking news events during 2014 this very impressive and data-rich blog post by Harvard Business School researcher Brian Keegan is 100% worthy of your time.