Example Hook form validate, get all node information after save news field
To grab your information before the node is saved you can use hook_node_presave, then if you want to gather information after its successfully saved simply use hook_node_update.

Also if you are saving it via the entity_metadata_wrapper you should still have access to the data after its saved.

$entity_wrapper-&gt;field_name-&gt;value(); //Should have field0, field1

//Add your value here

$entity_wrapper-&gt;save();

$entity_wrapper-&gt;field_name-&gt;value(); // Should have field0, field1, field2