The studio Grinding Gear Games (usually abbreviated as GGG) has already posted a lengthy explanation of this game balance in Path of Exile: Harvest (for the brief introduction you can click here, including the rework of Brands, Warcries, two-handed weapons and slow attacks, and much more.
"In the latest expansion of Path of Exile: Harvest, we are now putting much of our balance concentrate on Brands, Warcries, and two-handed weapons. As a result of Delirium going core, we have already taken the chance to balance cluster jewels (one of the Currency in Path of Exile and their place within this game. We have worked to improve two-handed weapons with big slow hits by improving these investment options across this board", they wrote.
The very first one is: BRANDS In Path of Exile: Harvest
Path of Exile's Brands, now are getting a nerf of sorts, because they allowed for a tedious but pretty effective playstyle of running around until everyone around you is dead.
The developer Grinding Gear Games also wrote "PoE's Brands now drop at their original or recalled location when the enemy they are attached to is slain. This stops them from chaining repeatedly out of the player's control, killing monsters that have not had an opportunity to meet the player yet."
Moreover, Brand Recall no more refreshes the duration of Brands, and it has a much longer cooldown along with much lower values of cooldown recovery per level.
The second one is: WARCRIES In PoE: Harvest
Nowadays, Warcries are more powerful but their longer use time comes with a much longer cooldown as well, which is no longer shared between Warcries by the way. This new expansion Path of Exile: Harvest adds a bunch more Warcry passive clusters for cooldown recovery, much faster use time, using multiple Warcries, etc.
The developers wrote, "The goal of these change is to have Warcries be something that has a far more significant impact on combat, also with great reward for taking the risk of standing still and using an ability while you get surrounded."
The third one is: TWO HANDED WEAPONS & SLOW ATTACKS
According to the latest information we get, two-handed weapons are getting some love and retaking their rightful place at the top of the power meter, while retaining the risk associated with using them in Path of Exile. Now, a slow and heavy hit will inflict enough hurt to stun the toughest of bosses, regardless of the stun mechanics, and this means, to some extent, to farm PoE Currency from those bosses will become much easier.
Good news is, Path of Exile's entire two-handed melee arsenal now has been rebalanced to offer ideal base damage for just about any type of player. What's more, most of the weapon types have their own implicit mods focusing on a specific mechanic.
And these changes come with additions to the passive skill tree offering utility and power, just like Tribal Fury or increased total recovery per second for life leeching.
Skills intended to work with two-handed weapons also got a boost, with Static Striker, Sunder, and Tectonic Slam getting the biggest reworks, but with ample numerical changes elsewhere.
Alternatively, you can learn more about the changes coming to Path of Exile: Harvest by clicking: https://www.pathofexile.com/forum/view-thread/2873295.