Debian + Antergos variants.
GTK3 check and radio buttons are done through CSS instead of with external assets.
Toolbuttons don't have the 3D effect applied to them anymore.
Unity support (only Ubuntu and Ubuntu-Alt variants)
Shell overview is darker with a slight gradients.
New window buttons.
More mundane buttons to avoid rogue white on white. Both buttons and entry fields inherit more of Suru to balance out their dumbing down.
Fixed some background color inconsistencies and numerous GTK2 issues.
The slider and terminal closer resembles Unity 8's. In the former's case, it looked too similar to Material Design's.
Checkboxes and radio buttons are now smaller.
Shell OSD elements now use a border image which lets them stand out a bit more.
The list view has soft borders between items for easier differentiation.
If using the transparent Shell theme and desktop icons were enabled, there would be a white line above the panel, this has been removed and desktop icon text is now white.
Tweaked transparency for visibility reasons.
Cleared up issue with the Shell crashing when opening a couple apps. Source was the background color to indicate running status in dash to dock so they've been removed. Sorry about that.
Tweaked the palette to match the Ubuntu/Suru palette.
The notification dot in the Shell theme matches the variant's primary color (orange for Ubuntu, blue for Fedora, etc).
Changed the look of the window shadow.
Overshoot/undershoot coloring is less prominent.
Thicker Shell calendar arrows.
Increased the size of checkboxes and moved over to new Ambiance-based check and radio buttons for irony's sake and also because Unity 8's assets are too thin and won't look good in case.
Selected progressbars were all white.
A couple small hover/active state styling inconsistencies.
Windows would pop when changing from focus from one to the other.
The Shell's rounded buttons would have a black background color behind them.
Dialog boxes had no shadow behind them.
GTK2 separators were the same color as the background. (W O W!)
Moved the design closer to a middle ground between Unity 8 and the original design concept. Lots of fixes and finetuning. The most drastic changes are the rounded corners and the palette being expanded a bit (with Unity 8's in mind). The primary color (the orange in Ubuntu's case) has also been toned down.
Some fine-tuning and variants for everybody. Also, 3.22 is supported.
The GTK2 and GTK3 themes have been overhauled and the Shell theme has gotten a couple of tweaks but nothing as extensive as the GTK themes. The purple buttons have regrettably been scrapped because of a dead end problem with Firefox, but hey, no more grey text on purple buttons at least! A Fedora variant is now included.