I found on github that they were making it lua but i dont actually know if its true

it's going to be english

Some rumors are saying it will be lua, but nothing has been confirmed yet
So, we don't know

Some staff say it could be Lua, but it’s all still speculation.

Theres say it will be Lua, but assuming that developer mode still uses node-hill to host, javascript will likely still be an option in developer mode

not sure about the "visitor" mode or whatever its called though

Yea I think it will be lua as there are young users that won't know javascript and for lua its very easy to learn but tbh I wish its java script as its very easy to flex and its very advance