+Due to words now being accepted as symbol function arguments, the
+interfaces of @samp{\accidentalStyle}, @samp{\alterBroken},
+@samp{\footnote} and @samp{\tweak} had to be redesigned where
+optional symbol arguments were involved. Please check the
+respective music function documentation for details.
+
+@item
+Several commands now accept symbol lists (conveniently entered as
+dot-separated words) for various kinds of arguments. These
+include @samp{\accidentalStyle}, @samp{\alterBroken},
+@samp{\footnote}, @samp{\hide}, @samp{\omit},
+@samp{\overrideProperty}, @samp{\shape}, and @samp{\tweak}.
+
+@item
+The bar line user interface has changed. Bar glyphs now resemble the
+appearance of the bar line, so a left repeat sign has to be coded
+as @code{.|:}. The command @code{\defineBarLine} provides an easy way
+to define additional bar line styles.
+
+@item
+Accidentals in the key signature may be printed in octaves other
+than their traditional positions, or in multiple octaves.
+@lilypond[quote,relative=0]
+\override Staff.KeySignature #'flat-positions = #'((-5 . 5))
+\override Staff.KeyCancellation #'flat-positions = #'((-5 . 5))
+\clef bass \key es\major es g bes d
+\clef treble \bar "||" \key es\major es g bes d
+\override Staff.KeySignature #'sharp-positions = #'(2)
+\bar "||" \key d\major b fis b2
+@end lilypond