Well, that's unknown, because we don't know exactly how that would work until we have more info on 1.19.
There is a chance for anything. Especially since there is not even any snapshots for 1.19 released... I don't understand how I could give a real answer beyond that (as others have mentioned)
I don't think there is much for new blocks. Lush caves will now generate, that has the best opportunity for seeing new things (along with the other world generation changes)
So glad I took a break from digging my tunnel in the nether. Get another update for when I pop out to Overworld. Sweet!!! Of course I will have to update my mods again...lol
I moved everything to townbut wondering about excat reset day and hour occoured because i still need for mining with beacon