At this point, what I want to know are only one.
Is possible for natsu have more element than he already had? (Fire then Lightning)
Black fire from one of the god slayer can't be used by natsu anymore, because that god slayer in the previous manga was artificial/fake.
Then again, I think Igneel had already entrusting his own lacryma to natsu. But so far no progression towards it. Let's hope mashima sensei can give them more ability upgrade.