I've checked recently and noted that I've sent 50 reports about MySQL bugs, features I'd like to see and unclear/missing manual pages this year. It all started with famous Bug #68079 (reported on January 14, 2013), that got a lot of attention, valuable workaround from Oracle and caused a lot of work that is going to improve MySQL scalability substantially in the future.
Oracle had also implemented this my (and not only mine!) feature request, Bug #69527, and in MySQL 5.7.3 PERFORMANCE_SCHEMA finally exposes metadata locks information. This is a great and long waited step forward in instrumentation.
Besides that, 12 of my documentation requests were satisfied:
I hope you had noted this already, but in case you missed it, please, read this post by Matt Lord and check any bug at http://bugs.mysql.com. As soon as you log in to your Oracle account, you can vote for bugs and feature requests! I hope that eventually somebody will publish lists of "Top N Most Wanted" fixes based on number of users who clicked on this great "Affects Me" button.
If you plan to use this new feature to express your needs while given a chance, why not to start with replication-related bugs in latest and greatest MySQL 5.6.12? Here is my "Top 10" list (starting with recently reported):
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