The Wheel will be updated shortly after the game becomes available. If there's an area where Heroes of Might and Magic V is quite different from the previous games of the series, it's the highly dynamic skill system that should allow a lot of customization with your heroes.. That said, it's been a while since I played HoMM 5 but with a basic skill you can have 1 sub skill like tactics or archery in the case of "attack" for example, with advanced it's two and expert is three. The arrows on the skill wheel represent the prerequisites to be able to get the specific sub skill that the arrow (s) are pointing to.
Heroes of Might & Magic V Skill wheel available online - fffonoff/HoMM-V-Skillwheel. The skill wheel is a fan-made addition to Heroes of Might and Magic V that lets players see how the skills in the game are connected. It shows which skills are available for each class, how to get them, and which skills must be selected to unlock the last racial skill.