After a few days with the new design, some other users and I still experienced that the icons when clicking persons in the chat room experienced seeing the old icons.
I snagged the followed image:
As can be seen, Hosch250 has gotten the new icons, whilst I still had the old icons. And this is after doing a complete restart of Chrome. Included in the image is the hint to delete your cache, which I did. This fixed the issue in my browser.
(This question is mostly for noting that this has been or is an issue, and that maybe the cache timeout for these images are a little high. This also gives the very useful hint of go hunting for the image cache of your browser to remove this issue.)