RPG Vault have posted part 2 of their Mimesis Online v1.5 Report. This part gives more details on the new combat system as well as some character development issues:
To attack a target, just double-click on it. Alternatively, a player may right click a target and chose an Attack option from a context menu that will appear. In both cases, the character will enter auto combat mode, approach the target and start attacking using base attacks. There are five different base attacks that characters perform randomly during combat. They differ in terms of damage dealt, and characters are not given all five at the start. Developing a skill family (e.g. Heavy Weapon skill family, see below) results in acquiring additional, more powerful base attacks.