Calling out some statistics I put together for OSCON, I think it is interesting to examine the cumulative number of monthly changesets in the JDK 7 forest from the time of the transition to Mercurial to JDK 7 GA:
This graph covers roughly three and a half years of the project's history, with the purple lines being time under Sun and the red lines being time under Oracle. The blue line is a scaling of the number of changesets per month, roughly the first derivative of the total.
The solid purple and red lines show the trend in the rate of change in the last year of Sun's stewardship of the JDK and the first year of Oracle's stewardship.
Under Sun, the rate of change was decreasing.
After a lull for some "Welcome to Oracle" events, activity on JDK picked up and was on average 15% higher in the first year under Oracle than the last year under Sun (≈244 changesets/month under Oracle vs ≈211 changesets/month under Sun).
The first year under Oracle included JDK 7 being feature complete in early 2011; however, JDK 7 wasn't done at that point!
Several JSRs were still in flight and subsequently there was a large push in March and April this year to wrap up activity in JDK 7 ahead of the rampdown stabilization period immediately before GA.