The studio have noted that it’s not usually their policy to talk about large scale updates in public so far ahead of implementation, but large scale skill revamps are an exception to this rule. This is because these changes will not be implemented in one giant revamp, but each content update will include a batch of updated skills, starting with update 3.3.0 in June 2018.
Skill revamp decision was triggered by the fact that there is a group of older skills poe exalted orb that were overshadowed by newer ones over the years. While some of them still have situational uses, most of them are outclassed in general. Grinding Gear Games took the Ice Spear as an example, since it ”performs somewhat adequately in crit-based builds against stationary mid-range bosses” but it requires a large number of support gems in order to hit multiple targets so it’s underwhelming against larger groups of enemies.
As you may imagine, skills like Ice Spear will not just be getting higher numbers incorporated into them, but rather new mechanics that will make them appealing for a variety of situations. They will also receive visual updates so they look pretty and shiny like the modern skills.
Skill themes will also be a topic in chaos orbs poe future development. This will apparently help players with achieving a specific flavour or a style that is in accord to a character’s theme. While these changes will not be ground breaking overhauls, they should help players make their characters fulfil a certain niche.