Indeed, the ThemeBuilder was not updated with the latest release. We just fixed that, and the change is effective immediately (you can use the same bookmarklet to generate the new skins).
Regarding your .less template question, it is part of the kendo source, which is available with the open source and commercial packages (but not in the trial package). It can be found in the source/styles directory.
Your Telerik points have been updated for the themebuilder bug report.
the Telerik team
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