May 25th 2008 9:54AM I wouldnt say molten core is for the "off nukes". There is a clear attempt to make fire the primary pve focus of destro. With cataclysm now giving spellhit + mana efficiency in tier 1, and molten core giving +fire dmg in tier 2 (remeber, immolate ticks will trigger it as well) you have viable non-shadow options in first tiers. Also, with emberstorm now giving +10% faster cast on incinerate in addition to dmg now, a lot of the shadowbolt vs incinerate scaling issues are resolved. This also lets you use the +10% fire only increase more effectively. Furthermore, casting immolate instead of a nuke was generally a dps loss at high gear levels, being able to "roll" incinerates means you only have to cast it once ever, allowing you to take advantage of both the dots dmg and the extra incinerate dmg without needing to cast it more than once (also allowing to skip bane in tier 2). Nerf to Imp. Shadow bolt further hurts shadow pve. Incinerate is also much more mana efficient, which combined with 39% mana regen in combat (assuming 3/3 demonic aegis) and spirit on gear, will mean much less dps lost while lifetapping.
Also spell haste makes plenty of sense in affliction, sense spell haste has been changed to reduce GCD, it is effective for instants now as well.