Blizzard just presented Zerg for StarCraft II in America and Korea. Also a couple of progamers tested the game and Zerg. Let's hear what they have to say:

Jaedong:
They said the queen was improved, but I was a bit disappointed. It has low HP, and died quickly.
It feels different, but you can still micro mutas. You can use bigger control groups, but you can't do hit and run like before. A lot of units have been added, so they game will change a lot

MYM]Moon:
Now I've tried all three races. The interface isn't that different from war3, so I'll be able to adjust easily. I think zerg fits my playstyle the best.

Pusan:
It's very similarto SC1 in general, but the graphics are a lot better. The new units make it look lik a lot of fun. I'm sad that the 3d takes away the feel of 'finesse' SC1 had, though. Playing vs zerg should be fine in sc2. If you start from the same place, the person who tries harder should win, right?

Stork:
The protoss graphics are great. The units just look so much better than sc1. SC is such a perfectly balanced game, so SC2 obviously needs a lot of balancing and tweaking in comparison. It will probably change a lot before release.

Zerg got a lot of powerful new spells, they seem stronger in general. It might be difficult to play vs a zerg who is good at using spells. In general, I think that you will have to focus on overall management, more so than micro.

Nada:
It's similar to SC1. Terran in particular is very similar. I'm disappointed they don't have many new things compared to other races. Zerg looked pretty fun. They have a lot of variety in units and upgrades. The queen comes out so quickly, so maybe TvZ will be hard."

Nal_rA:
It looks fun. For a game to be popular, isn't that the most important thing? I think it will do well when it's released. It's too early to talk about balance. Each race has new, powerful units, so it should be fun.

Upmagic:
It's really fun. I tried to look for strategic play as I tried it out. You can do some cool things with terran supply depots. The ability to raise and lower the depots has good walling possibilities. The nydus canal is a lot stronger now, you can use them instead of drops to attack the enemy's main.

Luxury:
It seems very different from SC... The queen is a lot better, and comes out very fast, so I like it. It's good for zerg that nydus canals are more useful now. Overlords lost their detecting (I think he missed the upgrade for it), but zerg looks better overall

Savior:
I was expected a lot from the queen, but it wasn't as strong as I hoped. There are a lot of new units and buildings, and I haven't figured them out yet. There are many powerful spells, and they should effect the game strongly if used correctly.

Bisu:
I tried SC2 for the first time today. There are quite a few changes. Zerg magic might be difficult to deal with, but we'll have to see. I'll try hard to be strong PvZ, if I play SC2!

Hwasin:
Zerg is stronger. The fact that all units can burrow is difficult. Their new, strong magic makes it so it won't be easy to play vs zerg.

If you want to read the full interviews with Jaedong and Stork, go over to TeamLiquid.net !