Some of my takes -

Pillagers - Not quite sold on it. How will they spawn and how frequently? Will the game try to detect a village? Do the pillagers destroy blocks as well? If so, then player homes and player towns will also be raided. Might be bad for survival builders.It'll probably be interesting for the technical community, though, but I'm not sure if the benefits outweigh the cons. If the pillager beast is actually ride-able, that'll give the PvP community another siege-type option (imagine a tanky mob that gives an AOE knockback effect).
(BTW, For some reason, the Pillager Beast reminds me of Reznor in Super Mario Brothers 3. I shall forever call the Pillager Beast "Reznor").

Villagers - Kinda of an unknown... For the technical community, Villager scripting might affect some villager farms. Will they actually try and sleep? Then farm production goes down (probably not a biggie, but who knows if different villager cultures will have different behaviors. Changes like these are always a double-edged sword, though - the new trading system could make for some interesting builds, or more specific, smaller farms. For the map making community, this would be a huge plus.

"Mob Packs" - (my name for it) I could see this idea coming a mile away! Designer-mobs and (eventually) scripted AI are a lot of map makers dream, and even for other players who just want to have not only their own specific mob, but a mob that doesn't require Forge (or the eventual Bedrock API) mods that have to be rewritten each version. This is probably the biggest thing I'm looking forward to, since it essentially means that, going forward, mods would essentially be backwards compatible with each other (...in theory). I think that this really is the start of a new era of Minecraft, one that lays the groundwork for future modding-related updates and packs. I've always thought that, since Minecraft 1.8 or 1.9, Mojang's (and Microsoft - for better or for worse) long term goal was to actually make all Bedrock versions, and even Java versions compatible in a series of "packs" (data packs, resource packs, mob packs, perhaps shader packs, and so on). However, there'll probably always be the debate (and I've seen this debated to the bitter end in other gaming communities) over scripted vs. actually using an API (Bedrock API or Forge).

Crossbows - I can only think of some older minigames that used something like a crossbow. heh. The triple shot seems fun if you're dealing with a large group of mobs at a medium range. Although, I think it's more useful as a mini-game or custom map feature where it has you fight a horde of mobs.

New Blocks - As a builder, this is always welcome.

Biome Updates (1.14? 1.15? I'm a bit confused) - So far it seems like a new plant, new mob (ostriches? really?... ok...) and some sort of new item. This one kind of sounds like we've only heard part of it. If this is 1.15, then maybe caves will be a part of it, as many in the community want. It could also be a collection of useful (?) items that many players wished they had.

tldr version - I don't find it as hype-worthy as 1.13 was, and 1.13 did renew my interest in vanilla Minecraft again. Not too sold on the villager & Pillager update, and don't know enough about the biome update yet to even say anything. The biome update doesn't seem terribly large - yet.

You know, the more updates we get, the farther away we step from the original minecraft 1.0 release, and thats pretty neat, considering that we are technically playing a ""alpha"" of minecraft 2 and are watching a new game come out of the old

It was pretty stable and could represent minecraft at its finest. I think that maybe, just maybe, the game is becoming a sequel of 1.0
Everything was revamped, the playstyle changed so much and even the final boss can be considered an evolution, like a "revenge out" edition of the old.

Minecraft 2 hype guys
But this is just a theory... A minetheory! (No, i don't claim the theory is mine just like minecraft's title does lol)