The building to the left of check in (in your photo) is the Londoner and is the newest building. Most units in this building are given to owners and II deposits as it’s listed as a separate code in II.
The building to the right is the Wembly or Seaside building and was built after the Grand but the units have not been recently upgraded as the Grand has. Both of these buildings along with an additional older wooden ocean front building (incorrectly labeled in the photo as the Londoner) all belong to the Tortuga Club as far as RCI is concerned and the resort HOA.
There is not a published list of updated units, but the poolside units are currently being updated and many of them have been completed and are very nice! I would be very sure to at least make that your second request after oceanfront.
Unless you specifically know someone in sales, room requests should be made 2 weeks ahead of time to the Florida office that handles reservations and unit assignments. 800-447-0309
Good luck. Hope you have a great trip!