It seems now you cannot change which group a user gets added to in your

It seems now you cannot change which group a user gets added to in your list based upon one of their answers in the form? (i.e. answer x goes to group 1, answer y goes to group 2)

It is not possible to trigger the integrations with the conditional logic. All contacts will be added to the list you selected when setting up the integration. 

How to Integrate with Mailchimp