I also wanted to show this point of view, this is what the mobs will act as if they are 100% accurate to their Minecraft Earth / Dungeons counterparts(plus anything that was confirmed).
It's also worth noting that I don't own either MC Dungeons or MC Earth, I had to look up how they will function in their games.
Iceologer; A lot less powerful then the Evoker, the Evoker is a miniboss in MC Dungeons, the Iceologer is thrown at you in hoards and you can outrun the cloud by running, the Iceologer will run away after because they don't have another attack other than the ice cloud. In terms of other effects/items/etc, we could get, the freezing potion effect and the Ice Wand(questionable, they clearly won't drop it if they remain a horde mob).
I've also seen people compare the Iceologer to the Phantom, the reason why the phantoms were hated so much is that they spawn too fast and too many. The tops of the mountains where the Iceologer spawns seems to sound like it's own biome or just super high up, if the former then it's easy to avoid, if the latter, then they will be rare depending on the new avg mountain hight.
Moobloom; We know from the trailer that they breed with bees (not pollinate the bees so they will not grow your carrots faster)so that is something different that we know is confirmed. Now how they act in MC Earth, you can shear them to get buttercups so you do have a new flower already which is a plus, they plant dandelions and sunflowers as they walk around, other than that, there a cow in both AI and drops. In my bias opinion, their griefers. The baby that you get when you breed a Moobloom and Bee might be worth speculation but I'm not going to add any. The abilities shown in the Moobloom trailer do not show the buttercup or planting flowers so those might not be added at all(I have a reason why at the bottom of this article).
Glow Squid; The mob vote info page says they will glow in the same way an enderman's eyes do, this means there not portable light as enderman eyes don't give off light, the color is just reflective. According to the Minecraft Earth wiki, they act just like a squid and drop 2-6 ink sacks. It's worth noting that the Glow Squid info video has not been released yet, so I'm hoping it will change. There is not enough info for me to say if it's good or not, I'll wait for tomorrow for the Glow Squid video.
Something worth noting, we could still get all mobs. They have not said that the others will be discarded, this is similar to the other biome vote announcement trailers. They also have a reason the release them all, the reason why we have mobs from Earth and Dungeons is so people will get interested in those games, so why only have people get a taste of one when they can get both. I'm not saying all will be added at Minecraft Live but the losers could be added at a later date like the biome vote losers.
I have links to them here.
I also want to say this, compare how much the Sweetbarries, Foxes, and Campfires changed from the biome vote and the final release, yeah not a lot. None of the items really varied from the vote description so a large number of possible features will only decrease the accuracy. This does not mean that the few features that will be added will not be innovated in the future like the Soul Campfire. The metric that I'm using for is how they compare when added and what updates could this item lead to in the future, IMO, the Iceologer wins what they add now, and the Moobloom wins what it could lead to, I'm keeping an open mind for the Glow Squid as well.
My sources for the research is the Minecraft gamepedia wikis for Dungeons and Earth and the videos/posts made by Mojang only.
Update: The final mob vote video video came out.
Now this is interesting, in the video, people where mesmerized by the Glow Squid. This is either and joke effect in which all it has to offer is it's pretty or it will have a mesmerizing effect, it's hard too tell so I suggest you to look at the video to find out for yourself.