Shroud of the Avatar will feature four offensive combat schools, which are¹:

There are also four defensive schools:

A combat sigil depicts the interrelationship of each school of combat:

Followers of the martial path use this mighty combat sigil as their symbol. The sigil shows the eight schools of combat that a warrior can follow. There are four armor schools: Light Armor (Cloth & Leather), Medium Armor (Chain & Scale), Heavy Armor (Plate), and Shields. There are four weapon schools: Blades (Swords & Axes), Polearms (Halberds & Spears), Bludgeons (Hammers & Clubs), and Ranged (Bows & Crossbows).

Sources

1. Update of the Avatar – 10/10/13: Combat Sigil, Story Sneak Peek, Basements, Druid Home, Bonus Rewards, & More!