Only thing new from Preview1 is the default parser switch from parse.y to Prism.

YJIT team seems to be rather quiet. I am wondering if there will be something coming in RubyConf?

> Array#each is rewritten in Ruby for better performance

beautiful, JIT all the things!

It is a bit light on JIT news, anything happening for this release?

There is work done on the JIT, but it seems to be mostly bug fixes. https://github.com/ruby/ruby/releases/tag/v3_4_0_preview2