@nyanide mostly bugfixes, and minor changes (most of which i would consider improvements, iirc profiles are improved quite a bit)
it also has fluoride mode which enables some minor js to let you refresh things without reloading the page (lets you avoid that mild flashing when it reloads but the css hasn’t loaded yet so theres just a blank background
also flouride mode refreshes the timeline automatically once in a while (but oddly not notifications), your post actually showed up without me refreshing manually which was nice