While the August 18th patch for Heroes of the Storm contained quite a few changes to the game, apparently there were a few things that went undocumented. These were revealed during a developer Q&A on Reddit, so take a look at all of those changes below (thanks to heroesnexus.com for condensing and formatting):

• Abathur 
  • Ultimate Evolution Heroic - cooldown from 70 seconds to 50 seconds.
• Tychus
  • Commander Odin Heroic - 100% increased Basic Attack range down to 60% increased Basic Attack range.
  • > This is likely just a tooltip update! Odin's range didn't change from the previous patch to this one, but since Tychus' basic attack range was changed in the previous patch, there's a chance they forgot to update the +100% range tooltip for Odin).
• Diablo
  • From The Shadow Talent - increased stun duration was decreased from 1.5 seconds to 0.5 seconds
  • Siphon the Dead Talent - Active Heal from 15% to 15.6% but shown ingame as 16%
• Kerrigan 
  • Double Strike Talent - your next basic attack after an ability does from 50% extra damage to 75% extra damage.
• Nazeebo 
  • Gargantuan Stomp (R) - cooldown from 4.5 seconds to 5 seconds.
• Uther 
  • Redemption - no longer revives you if picked after dying.
• Murky 
  • Difficulty Rating - changed from Medium to Hard.