Yes
Can these be found be anyone or just the top 1%?
They're on the tree, you don't need to find them.
You have a small window to activate as many collectors as you'd like and then you aren't able to target anything when monsters are alive except the exit portal.
With those changed to how brands work as well as brand recall that sounds like it's going to make brands feel so bad to play. Especially them not dropping at a monsters feet anymore.
I've really enjoyed them in the play testing I've done but it's worth trying them yourself to make up your own mind.
Is there any kind of internal cooldown on how often Arcanist Brand can trigger a spell? Or was a cooldown not needed in this trigger because it has the activation rate gating it?
Arcanist Brand has its own activation rate, modified by cast speed just like other brands. The cast speed of the skill itself is irrelevant, but Arcanist only triggers a single linked spell each activation. This means that the more cast speed and activation speed you have, the more frequently it will triggers spells.
In Path of Exile: Harvest, we're introducing several new Brand skills and one Brand support gem. We've also reworked existing Brands and reviewed how their mechanics work. Today's news covers what changes to expect and provides a preview of the new Brand gems. Changes to Brands
Brands were first introduced many leagues ago with Storm Brand and Armageddon Brand. Brands are all cast on a location and attach to nearby enemies, repeatedly activating to perform their unique effect. They detach if the enemy dies, ready to jump to another target.We've finally added some new Brand skills: Arcanist Brand, Penance Brand and Wintertide Brand. These come alongside new options for how you can build and play Brands, like the new Swiftbrand Support. These additions introduce a more aggressive, active play style.Arcanist Brand
Arcanist Brand is a new Brand skill that also supports any triggerable spell linked with it. Each time the Brand activates, it triggers a su... Read moreWill existing jewels in Standard be converted to giving the new Keystone or still give the old one?
They still have the old one but will only roll new possibilities when you use a Divine Orb
Shouldn't be too much longer. Maybe an hour or two.
u/Bex_GGG do I win the game now? :)
I'm sending you a free copy as we speak.
Very cool!
Will Skin of the Lords also be updated with these new keystones?
Yes
So do the timeless jewels get new ones or?
They do
Is there any new keystones that are not from the timeless jewels?
Yes
You can still get Orbs of Delirium from Delirium content.
It's nice to see so many good-natured memes about Harvest.
In this post we will compile all the Harvest teasers as they're posted. The most recent will always be at the top. 
Tawhoa's Chosen skill triggers when you use a slam attack, creating an image which mirrors your Slam att...
Read more
The Duskblight unique boots have received a new skill!
SpoilerHere are the starting levels for the new gems in Path of Exile: Harvest
Spoiler
Here's a preview of The Traitor, a new Timeless Jewel Keystone
Spoiler
Here is a video of the new General's Cry skill in action!
SpoilerCheck out the Chieftain changes in Path of Exile: Harvest
SpoilerTawhoa's Chosen skill triggers when you use a slam attack, creating an image which mirrors your Slam att...
Read more
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I already work through the weekends to post teasers, I'm not staying up all night too :P The good thing about teasers is that once they're up, they stay up so you can view them when you're ready.
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Comments like this make me want to be less transparent with you.