My understanding is that when a druid goes into Wild Shape their melee attacks are considered Natural Attacks and lose the base damage die of the equipped weapon. The effects on the equipped weapon however, carry through.
For each instance below, assume Winter Wolf Wild Shape:
Instance 1: I am wielding a +5 Flaming Scimitar of Bleed, each of my melee attacks will gain +5 To Hit & Damage, +1d10 Slash/Pierce Damage, +1d6 Fire damage and finally +1d8 bleeding damage, correct?
2nd instance: I am wielding a +5 Metalline Scimitar of Pure Good and attacking a Marilith (DR Cold Iron + Good), I should not notice any Yellow numbers due to the Metalline and Good providing the necessary DR overrides, correct?
3rd instance: I am wielding a +5 Flaming Cold Iron Scimitar of Pure Good and attacking a Marilith, will the Material Type (not an effect) carry through my Wolf form in order to overcome the DR?