I just read the patch notes as follows:
Enchanting
Fixed an issue that was resulting in several jewelry enchantments scaling based on the jewelry piece's quality level instead of the glyph quality and level. These enchantments now work off the quality of the glyph, as intended. This fix is retroactive. Affected enchantments include, but are not limited to:
Bashing
Potion Boost
Potion Speed
Reduce Feat Cost
Reduce Spell Cost
Shielding
What exactly has changed in regards to potion boost and potion speed glyphes? As far as I know, those glyphes, regardless of the quality used, always have the same effect. 3 seconds for potion boots and 5 seconds for potion speed. Has this changed?