The new Sharpshot bow has uber advanced arrows with higher damage than normal advanced. My maxed out glowblast w/mods is doing 156 impact damage. New sharpshot bow starts at 224 and is 306 when maxed out, without mods. And being legendary weapons, they have 5 mod slots vs 3. It also low percentage chances for instance shock on hit and a 1% of an explosion on contact.
The new hunter bow has advanced purge water arrows so it pairs nicely with the Sun Scourge bow for elemental coverage. Also has extra tear damage as a perk.
Most of the rest look like mostly small damage bumps vs the old legendaries and different perks. The new spiker thrower has a 6% chance to instantly start corroding an enemy, new warrior bow as chance to instantly burn, etc.