Regarding the AP item changes
Overall it's pretty good. Defining Liandry as a tank item (even though I think some AP could be removed in favor of more healrh), Morello is finally an assassin item and mages finally have more first item options.
However I there is one thing that bugs me.
The lost chapter evolution don't need an extra 10% CDR along with the new passive in my opinion. Mage items (and most items in the game in general) are already saturated by CDR. Zhonya: 10% CDR Banshee's veil: 1O% CDR Nashor Tooth: 20% CDR Lichbane: 10% CDR Protobelt: 10% CDR I know that most of these are niche items but the 40% CDR shouldn't be easy to reach nor optimal.
Tl;dr: The new Haste passive on the new Lost Chapter item line is good and should be kept but the extra flat cdr on the final items should be removed.
is losing its CDR and is now not going to be the usual first item rush anymore. With most classes having a way to easily reach 40% CDR thanks to them having options in 20% CDR items, mages only had Morello on live to reach it (which is also why most other AP items gave 10% as well).
mostly but now 
is also going to be a pretty decent option as a first item as well.
