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Zerg - Crazy buff cross-wide, Spire is big buff, Baneling is huge buff, Shroud is crazy buff. The nerf to Mana and upgrade is there but not that significant. Zerg only has buffs at this point, and should help all non-serral zergs.
Protoss - 1st patch may have felt overdone, but Protoss players may feel satisfied with this interation
Terran - This patch's biggest loser. TvP's problem was that Zealot-Stalker was very strong. Collosi isn't bad, and Storm is OP on current patch. But PTR leaves Zealot-Stalker, Collosi alone, while Storm isn't bad. TvZ gets shroud buff + spire buff + baneling buff. TvZ is Zerg favored in my opinion at high level, but Cyclone gets nerfed on top, which I think TvZ will get ruined and Z heavily favored.
Goal of this patch should be getting TvP to 5:5 since it's heavily P favored right now. But doesn't seem to do that. Feels like it changed from 7:3 > 6:4 to Protoss favored.
As for TvZ, think it's 5:5 overall (No Serral), but Zerg favored when Zerg is good. W/ this PTR, it's at least 6:4 Zerg favored. But better Zergs may have 7:3 on their favor.
Patch has some very surprising things, but they will change a lot more later, right?
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Zerg
Spire - Blizzard may be encouraging Spire play since LBM is rarely used. Spire is double-edged sword currently. If it works, it's amazing, but game is over if it doesn't. Muta is too polarizing right now but this encourages variety in unit comp. It's not bad, but honestly only good for Zerg
Baneling - LBM currently honestly is strong vs Terran. If you manage to get to 20+ mutas, LBM is plenty strong currently. But buff to baneling and Spire may make LBM comp a viable comp and welcome change to people who enjoy LBM-style vs Terran. It's not autowin comp but viable after this.
Shroud - Mana increased from 75 to 100. Felt really strong at 75. Addition of upgrade but should be really strong even with those.
Protoss
Energy Overcharge- Nerf makes sentry only cast once, and only 1 storm instead of 2 on HTs. Defensive/scouting nerf. But there was buff to make up for it on reuse.
Mothership - Nerfed on Zergs having hard time abducting. For Zergs, it's very good patch and I'm thankful.
Storm- hard to say if it's buff or nerf, but I think it's a buff for beginners, nerf for progamers.
Observer - Nerf to siege mode to have it not invisible, but also increased vision allows Protoss to save them if seen.
Disruptor - Make-up buff for nerf to Storm. Very big buff
Oracle - Stasis ward nerf. I like this a lot because length previously was to point Protoss forgot they even casted it.
Terran
Siege tank - I understand the buff to this, since ghost supply is 3 and terran will have hard time holding position. And there's microbial shroud, so there's another way to mitigate damage. But this is all under ideal condition.
Viking - The gas reduction may have felt huge, but don't know how it will feel anymore after revert
Liberator - I don't quite know why the sight reduction from 10 to 9 happened, but my best guess is because Liberator had some abusable spots where they could fire w/o taking damage from Stalkers. But was that really needed? But I don't think Terrans will take this as a huge nerf anyways because liberator is giga OP at worker harass in first place! You need to nerf that. And late game usage will be similar. The early game impact on mineral siege at around 4-5min where Stalkers can't hit back should be nerfed.