Theres some other preseason stuff in this:

Map changes are in:
Baron pit is the same until Baron spawns where it looks like Baron just Broke down part of the pits walls.
Area around Mid T1 is way more open and the Jungle entrances on the south west/north east now force you to move through the Tower, walls adjusted to fit this.
Maybe Im tripping but mid as a whole looks alot more open
Red side top entrance at T1 turret moved back
Blue Side bot lane now has 4 Jungle entrances with the current middle one split.
Red side botlane new Jungle entrance near Gromp
New Path added between river and Blue buff

Items:
Haunting guise is back, Liandries no longer a mana Item
Triforce now builds out if Noonquiver
Ancient coin (Yellow supp Item) is back
Yuumi has what seems like new potions and no supp Item, she later also has the skillpoint pot in her inventory, possible Klepto return? (She has spellbook as Keystone though)
Nocturne has a weird looking Item in his inventory at one point and it seems to build into Axiom Arc, Icon seems Placeholder like.
Kaisa has a new Item at one point
Ludens cd is noticeably lower and has some sort of stacking mechanic.

Completed Items that seem to stay around: Ludens, Liandries, Mejais, Shadowflame, Cleaver, Ghostblade, Eclipse, Axiom Arc, Nashors, Stormrazor, Navori, Imperial Mandate, Shurelyas, Triforce, Ravenous, Chempunk chainsword, Rocketbelt, Voidstaff (Now builds from Needlessly?), Rageblade, Kraken, Staff of flowing water.

Note that nothing here is confirmed and subject to change