Reader MuhsSalah commented that when Samsung update some Galaxy lines to Lollipop, it would still have TouchWiz on it. Looking into it further, there seems to be new theme options in TouchWiz (I was surprised it wasn’t there already). As part of these themes, you can get different icon styles all the while keeping the ‘meh’ that is TouchWiz.
One of the screenshots seems to have Nokia Squircle Icons. Are those from Sammy or perhaps you can put your own third party themes into it?
A few sources mention the wood theme as being part of the TouchWiz party. The more consistent squircle (or any shape really) for the icons definitely looks better than the standard offering from Sammy.