Natural Spell grants druids the ability to cast while wildshaped. Normally, druids cannot cast in animal form because they are unable to fulfill the spell's requirements for somatic and verbal components.
With Natural Spell, does that mean druids in Wild Shape no longer need to bring these components, or does it grant them the abilities required to fulfill the spell's requirements?
Both would bring their own issues. If the first would be the case, it is impossible for the enemy to (for instance) counterspell the druid, because they cannot see them casting.
If the second is true, druids can talk while wildshaped, which is an interesting notion.
The feat specifically states it at the end of the description in the PHB (emphasis mine):
Furthermore, the feat clearly states that the verbal and somatic components are replaced by sounds and movements that the animal can normally make, such as the stated example of a hawk in the PHB:
However, the question regarding the material components is a very interesting one as that is not explicitly stated in the feat text. The PHB text is as follows:
To interpret the word use here we have to look at page 174 of the PHB which states what use means for both a material component and a focus (emphasis mine):
The description clearly states that any material components are destroyed. Now let's look at the description regarding a focus (emphasis mine):
Here the description clearly states the when using a focus, it is not consumed. Therefore, combining the above it is clear that the feat allows the caster to consume the material components that the original form had on him, as well as allowing the (re)-usage of a focus. This also maintains balance as giving them "the abilities required to fulfil the spell's requirements" would lead to balance issues with spells that use an expensive component (to prevent over use).