This PDF is 13 pages long, 8 of which contain "crunch". Two pages are ads, one of which is for another company's product. Artwork doesn't matter too much to me rating-wise, but I enjoyed the art in this book. I can't shake the feeling that I've seen the Magus on page 6 before though.
Regardless, here are the Arcana:
Animate Weapon: As the spell says, it allows a Magus to animate a weapon, much like the Dancing weapon property does. If having animated weapons isn't cool enough, on a Disarm attempt the magus can animate an *enemy's* weapon.
Athame Knowledge: Grants one weapon-related feat for a while. Black Blade magi can use their class level as their BAB for purposes of selecting a feat.
Athame Surge: Expend a spell slot to gain an enhancement bonus to your weapon equal to half the level of the spell expended. Can spend this on weapon abilities too.
Augment Physical Prowess: Increase a physical stat by two.
Black Blade Riposte: Anyone who attacks the Magus is counterattacked by the black blade, using the Magi's AoOs.
Born to the Black Blade: Bonuses to initiative and DCs of spell combat spells.
Bounding Step: "Dash" to a location, and be treated as flying for the movement.
Charge of the Magi: Charge an enemy for extra force damage, and knock him prone. While going towards enemy, you are treated as flying.
Damage Shield: Fairly obvious.
Doublefire Wand: Can use two wands or two staves instead of a spell during Spell Combat.
Eldritch Athame: Change the type and size of a weapon, gaining proficiency with it.
Energy Burst: It's like Channel Energy, but with one of the five elements instead.
Energy Web: Enshroud an enemy in a web made of energy that deals damage each round, and gives bonus damage to the attack that places it.
Flattening Strike: Smash your enemies away from you and to the ground! Thor approves.
Force Adept: Gain mage hand at-will, and eventually be able to use Telekinesis. Only spellblades can take this!
Free Step: Run fast and up vertical surfaces!
Malice: Opponents affected by the Hexcrafter's hexes are hurt extra.
Maneuvering Strike: Next CM doesn't provoke.
Necromatic Strike: Either hurt living creatures, or possibly destroy undead.
Nigh Irresistable Strike: Lower SR, Energy Resistance, or DR for a while.
Opportune Strike: Cast a spell on someone if you hit them with an AoO.
Overcome Circumstances: Shrug off or delay conditions.
Searing Shield: If Spell Shield makes an enemy not hit the Magus, the enemy takes fire damage.
Serpent-Eyed Strike: Make a target flat-footed by distracting him with a hypnotic pattern.
Shield Caster: Lets a Magus use a shield, and still be able to do spell combat and magus arcana.
Slice Through Wardings: Ignore magical protections such as Stoneskin and AC bonuses.
Song of Arcane Triumph: Add sonic damage based on your level to your attack.
Song of Death's Herald: The target of this ability takes a penalty to AC and the Magus is treated as having a higher crit range on her weapon, which stacks with Keen-effects.
Song of the Blade Dance: Gain bonuses to hit and AC.
Song of Victory: Inspires the Magi's allies and weakens their foes.
Stalwart: Attacks that provide diminished effects on successful Fort / Will saves instead do nothing. Hexcrafter only.
Ultimate Eldritch Athame: Permanently alter the bonuses and abilities of your weapon as a free action once per round. It must have the same total as before.
Vampiric Thirst: Self-explanatory
Wave of Mutilation: Deal force damage in a cone.
Archetype: Singer of Blades. This is for Elves or Half-Elves only. This archetype gives bonuses while using a longsword or rapier in one hand, and nothing in the other. These include a dodge bonus to AC, and the ability to take 10 on Concentration checks even in combat. They can also treat one hit as a Critical Hit and further do a single melee attack against all foes within 30'. These last two abilities come at level 19 and 20, so they may not see much use.
7 new Feats:
Bladebound Defense: Can't be flanked when holding Black Blade.
Clinging Touch: Pool Strike does damage the round after.
Crippling Touch: Pool Strike deals scaling strength damage.
Dance of Ruin: Use Perform (Dance) to give bonuses to Spring Attack that scale based on your result. Very cool idea!
Dance of Death: Use Perform (Dance) to give bonuses to hit, damage, and AC when using Whirlwind Attack. Even cooler idea!
Deny the Afflicted: Creatures affected by your hexes lose one iterative attack against you.
Improved Reflection: Redirect where the spell you reflected goes.
Magic items: There are three new ones.
Crystal of Arcane Assimilation, Gloves of Arcane Gathering, and a minor artifact sword Mournsky.
Overall, I really enjoy a lot of the options this book offers. The arcana Charge of the Magic and Bounding Step allow for some really cool cinematic-like abilities. Flattening Strike sounds awesome, and could work really well with a Dwarven hammer-using Magus, for thematic reasons alone.
With a more flexible rating system, I'd rate this a 4.5.