Highlights of the new thumbnails include:
Bigger thumbnails and a new grid system allows more emphasis to be placed on art.
The old grid leaves uneven or irregular gaps between images, while our new grid maximizes screen space to create a wall of beautifully displayed deviations.
The new thumbnail grid is optimized for bandwidth. Images will use slightly more bandwidth, but less bandwidth used across multiple pages.
Thumbnails are optimized for retina and high-resolution screens.
We put special care into the look of non-standard image types, such as literature, pixel art, and emoticons ensure that kinds of art are featured respectfully and beautifully.
Please note: During this test, the new thumbnails will only be displayed on search and browse pages.
What to know:
Who has access to the new thumbnail grid?
Beta Testers only.
Will the new thumbnail grid be on all pages?
Eventually, yes. However, during this test, the new grid is only available on browse pages, search pages, and tag pages on the desktop site. The new thumbnail grid is not currently testable on the mobile site, however, it will be once it launches.
What happened to being able to drag-and-drop thumbnails into my favourites?
While the ability to drag and drop thumbnails into your favourites isn't available in the new thumbnail grid beta test, we're working on a new solution that'll let you easily add deviations to your favourites. We'll be sharing more details about this soon.
How can I help test the new thumbnail grid?
Use it! Tell us what you like and what you don’t. Do you enjoy the way different deviation types are presented as thumbnails? Leave a comment on this journal. Found a bug? We want to know.
What types of bugs should I look for?
Loading issues
Cases of specific deviations not displaying properly
Alignment and display issues
How do I provide feedback or report a bug?
General feedback can be left in the comments of this article. If you run into bugs, submit them to the bug tracker under the New Thumbnail Grid project and we'll work to get everything fixed as soon as we can. 
Please remember that this is a beta test and you may run into bugs. We appreciate your help and feedback on this project and we're excited to share it with the rest of the community! 
