How will the de-commisioning of the google email provisioning API as of 8/31/13 affect the user.emailLists feedLink?

How will the de-commisioning of the google email provisioning API as of
8/31/13 affect the user.emailLists feedLink?

Google has been sending out announcements reminding all customers that
appear to still be using the Email List Provisioning API that the API will
be de-commissioned on 8/31/13 and that applications that use it should be
updated to use the new Directory API.
My application only uses the email list API indirectly, in that the User
Provisioning API will return a feedLink element on User entries that
points to the emailList API for a list of email lists/groups of which the
User is a member.
I'm wondering if that feedLink will a) go away; b) remain but be broken
since the API it points to is gone; c) remain and actually work
transparently; d) be replaced by a different feedlink; e) some other
option that I haven't thought of.
This is important because using new Directory API is a massive change and
yet doesn't seem to provide a simple documented way of retrieving the
group memberships for a single user anyway.