My pile of the new round tile with hole took a little longer to acquire than I had hoped hence the delay. When I first saw this part in the new Parisian Restaurant reviews, I knew this would change the face of building. Maybe not the entire face but at least some of the less vital parts; ears, hair, etc.
This new part 15535 is sort of a refinement to the earlier Exo-Force 53993 disc. That disc maintained a happy 3.2mm of typical system thickness but has a diameter of 13mm as opposed to a more responsible 16mm. There are reasons for this diminutive dimension I'm sure but much like the similarly small gingerbread man head, I haven't deduced it. Part 15535 allows for normal clutch connections (much like it's ancestor the round tile). But it also allows for anything of a 4.8mm variety to be stuck in the middle. Appropriate bits include studs and technic pins. I'll let the pictures speak for themselves.
This is just a small sample in 5 minutes of some of the possibilities. I can see these parts getting a lot of mileage in the very near future. Oh, and Happy Thanksgiving to my US-ian readers.