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A general description is here.
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‘tcltk::tclVersion()’ now only optionally includes the ‘patch level’, as Tcl full versions can be of the form ‘8.7a5’ or ‘9.0b1’ without three clear components.
The graphics engine version, ‘R_GE_version’, has been bumped to ‘17’ and so packages that provide graphics devices should be reinstalled.
The ‘glyphFont()’ function gains a ‘variations’ argument, which allows variable font axes to be specified, e.g., ‘c(wght = 100)’.
Only Cairo-based graphics devices (but not ‘cairo_pdf()’) support variable font axes so far.