- I personally don't see any moonkin comp will be viable but Ele / Boomer / Hpala..
Probably not true, note that the mana cost reduction with a 3 stack is now only 30% instead of 99%. Sure you can spam moonfire for an eclipse but it's going to crush your mana to get there, and the mana return from eclipse is pretty negligible.
The mana cost of Moonfire / Sunfire will remain the same, and from next patch the mana pool we've got has increased by a huge amount, right now as it is we gain 16% of our total mana. A druid playing with int gems & furor have about 120k mana
120.000/100*16 = 19.200mana we gain from an eclipse without counting procs such as darkmoon trinket, Power Torrent or Engineering glove enchant.
In 4.2 we're gonna have nearly 150k mana, which will give us far more mana when triggering an eclipse.
155.000/100*16 = 24.800mana, which might not sound like alot, but on average basis gaining 5k more mana everytime you've triggered an eclipse will mean alot in the end.