Building on the statement above regarding Celestial Focus, according to the latest SimCraft data for 3.1 (), there is now less than a 1.5% difference between Wrath Eclipse and Starfire Eclipse if you are optimizing your cast cycle for one or the other. This is good news for Druids who like switching things up, or more significantly, who like me find themselves losing DPS due to accidentally proccing Wrath Eclipse.
The not so good news is that Wrath spam is demonstrably less mana efficient, resulting in a higher probability of going OOM in a long fight. This is because of two things: Wrath has a lower DPM than Starfire, and you will need to refresh Moonfire more often because you aren't extending the duration with Starfire.
The really bad news is that SimCraft places us well over 10% behind Surv/Marks Hunters, 15+% behind some Warlock builds and HaT rogues, and a whopping 20% behind Ferals. I can only hope that the data is skewed or the numbers for those classes come down a bit before 3.1 launches.