Leona Nerfs
Champions
Rek'Sai Base HP lowered to 570 from 611.2
Leona Zenith Blade (E) [Missile Width lowered to 70 from 90?] [Thank the lord.]
Lulu Base Mana regen per second increased to 1.7 from 1.2 Mana Regen Per Second Per Level lowered to .12 from .16 [Note: ricklessabandon noted on Twitter: "yup! trying out +2.5 mp5 at level one and being -almost- the same at 18. goal is to help lane for lulu, especially as support."
Items
Abyssal Scepter [Currently has a rework on the PBE] Ability power increased to 40 from 30 Now deals 40 (+2 per level) damage every 2 seconds from 80 (+5) every 4 seconds. Magic Resist reduction on unique passive now [5% for 6 seconds, stacking up to 6 times for a total of 30% ] FROM [15% for 10 seconds, stacking up to 3 times for a total of 45%]
Banner of Command [Unsure but seems like the promote cast range was increased to 1200 from 1000. Will need to confirm in-game]
Blade of the Ruined King Active range increased to 550 from 450 [Note: This change was added in the 5/13 update. Context from Meddler here.]
Bilgewater Cutlass Active range increased to 550 from 450
Not really sure about the Rek'Sai nerfs.
change a nerf but potential buff? Allows her to weave it between minions better.