Philip Rothman at Scoring Notes:
Sibelius 8.6’s new engraving feature is magnetic glissandi lines — lines that snap to both their start and end note, updating their positions if the notes change.
Magnetic glissandi lines are quite intelligent, expanding and contracting to move out of the way of augmentation dots and accidentals. They will even slope in the correct direction between two pitches that share the same space or line.
You’ve got to check out the examples in this post. Two years after the disappointing launch of Sibelius 8, this is the first new feature that has me interested in upgrading from Sibelius 7.5.