Here are the latest Demon Hunter changes that went live in the first War Within Beta build!
Demon Hunter Changes
Sigil of Misery - Place a Sigil of Misery at the target location that activates after 2 sec. Causes all enemies affected by the sigil to cower in fear, disorienting them for 20 15 sec. New Demon Hunter Set Bonuses
Demon Hunter Havoc 11.0 Class Set 2pc - Blade Dance deals 20% increased damage. Demon Hunter Havoc 11.0 Class Set 4pc - Chaos Strike deals 20% increased damage, and has a 25% chance to reset the cooldown of Blade Dance. Demon Hunter Vengeance 11.0 Class Set 2pc - Soul Cleave deals 15% increased damage and has a 35% chance to shatter 1 Lesser Soul fragments from a target it hits. Demon Hunter Vengeance 11.0 Class Set 4pc - Consuming a Soul Fragment increases the damage and healing of your next Fel Devastation by 2%, up to 30%.

A Demon Hunter player has speed-run Mogu'shan Palace in 29 seconds, only killing the very last boss of the dungeon.
I believe this is the same Demon Hunter who clipped through Scholomance and killed the final boss in 13.45 seconds upon zoning in to the dungeon.
Here is a video of the speed run.

You can send currency to your alts in The War Within pre-patch!
The new pre-patch for The War Within includes a tab that allows you to send currency directly to your alts. MrGM looked into which currencies can be transferred and discovered that you will lose 17% of Cosmic Flux, Soul Ash, and Soul Cinders with each transfer, and up to 24% of War Resources.
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In The War Within, the PvP category will be removed from the Great Vault, and Blizzard has increased both the weekly Conquest cap and the rate at which you earn it.
(Source)
With The War Within, we’re removing the PvP category from the Great Vault. As a part of this change, we’ll be increasing the amount of Conquest you can earn each week and increasing the rate at which you earn it.
Here are the new weekly Conquest caps as compared to Dragonflight Season 3:
    Dragonflight Season 3 Conquest Cap The War Within Season 1 Conquest Cap Week 1 1350 1600 Week 2 1900 2200 Week 3 2450 2800 Week 4 3000 3400 Week 5 3550 4000 Week 6 4100 4600 Week 7 4650 5200 Week 8 5200 5800 Week 9 5750 6400 Week 10 6300 7000 Week 11 Conquest Cap Removed Conquest Cap Removed Here are the new Conquest earnings for certain game modes as compared to Dragonflight Season 3. These are subject to change:
  Treasure Table Name Old Value New Value Epic Battleground - 1st Daily Win 110 125 Epic Battleground - Subsequent Win 25 30 Brawl (Arenas) - 1st Daily Win 15 18 Brawl (Arenas) - Subsequent Win 3 4 Brawl (Battlegrounds) - 1st Daily Win 40 48 Brawl (Battlegrounds) - Subsequent Win 8 10 Arena 3v3 - 1st Daily Win 45 52 Arena 3v3 - Subsequent Win 80 93 Arena 2v2 - 1st Daily Win 35 40 Arena 2v2 - Subsequent Win 75 88 Rated Battleground - 1st Daily Win 85 98 Rated Battleground - Subsequent Win 175 200 Rated Battleground - Close Loss 45 54 Arena Skirmish - 1st Daily Win 25 30 Arena Skirmish - Subsequent Win 5 6 Random Battleground - 1st Daily Win 70 80 Random Battleground - Subsequent Win 15 18 Rated Solo Shuffle - Subsequent Win 50 58 Rated Solo Shuffle - 1st Daily Win 100 115 Rated Battleground Blitz – Close Loss 25 30 Rated Battleground Blitz - Subsequent Win 50 58 Rated Battleground Blitz - 1st Daily Win 100 115

Blizzard have responded to feedback on trinkets specifically on the Beta. The big takeaway is that their tuning is very much not complete and the next build should see most of them at where they're intended. We also got direct responses on three trinkets specifically, with explanations in how they're supposed to work and what they are intended for. 
Trinkets (Source)
Thanks for the feedback so far! We’re not going to be able to respond to every point, but there are a few things I’d like to address now on the raid trinket side.
Regarding tuning generally, many trinket effects were impacted by subsequent scaling changes, and their current beta values are likely misleading. Most will be fixed in the next beta build and should be relatively close to the final numbers.
  This trinket is intended to stack up roughly once per minute, so your experience here sounds like a potential bug with its proc triggers. We’re okay with a bit of occasional mystery as long as its reasonably learnable (with something like Inscrutable Quantum Device’s ??? tooltip at the extreme end), but we can look into ways of making the trigger effect requirements clearer in the moment.
  This is intended as a DPS trinket with a minor bonus heal. This will be changed to be castable while moving in a future build.
  This trinket will be entirely or partially restricted to tank specializations in a future build given the relative strength of its max health effect for other roles as you point out. The next build will also see its tooltip reflect that the health increase is converted to an absorb shield immediately leaving combat; it is not intended that players should be able to easily stack additional max health across the entirety of a M+ run. All PvE trinket effects are also significantly reduced in PvP (50%+). Your critiques are appreciated, and we’re keeping a close eye on this one.