Most of the changes won’t be visible (except for tweaks to the header that were made to condense the space to get the question list higher); these tweaks go along with recent updates that were made to Stack Overflow:
- We are moving the site's CSS to a newly refactored LESS system, so that it's easier for us to fix SE network CSS bugs globally and launch new features in the future.
- We are updating the graphics to SVG for retina support.
- We've fixed a LOT of obscure bugs that arose when new features were not thoroughly tested across the entire network.
- Visually it should "feel" the same as the old site with slight layout adjustments.
But more importantly, it will give you access to the new profile!
This update should retro-actively fix most of the old design bugs. If you see any new bugs, or old ones not yet fixed, please post an answer here to let us know!