Advanced Arcana begins with an in-character introduction before talking about the new sort of spell included, namely the segmented spell, which is very powerful spell that requires multiple spell slots and castings to activate. There are also a variety of spells that allow the caster to recall expended spells which is an interesting design choice allowing for some interesting options, and quick spells whose effects vary based on how much time is used to cast them, also an intriguing design choice.
Many of the new spells, almost a third, are 7th level or higher which -to my mind- rather restricts their utility and two of the 1st level spells have their duration based concentration which drastically restricts their usefulness. While, like most spell lists, they are mainly combat focused there are a few non-combat spells in the mix as well.
Advanced Arcana really shines for me in its supplementary material: Eight new clerical domains, while Force was unneeded, the domains of Creation and Vermin are full of possibilities. Four new Sorcerer bloodlines, one for each of the classic D&D genii types (Dao, Djinn, Efreet and Marid in case you have forgotten). Eight new Focused Wizards schools allow for further specialization, though the choice of Idiocy (for wizards who can inflict Intelligence loss at higher levels) as a school name is a bit odd. Lastly, there are eight new familiars including animated objects, newts, skeletons and bonsai! All quite fun and could lead to some very interesting interactions.
There are a lot of useful tools here for GM and player alike, but it seems unlikely that you will want to use all of the options available here.
[4 of 5 Stars!]