Wrath Classic has Large UI Changes ?

[SDPhantom]

Originally Posted by ZpiX So I could just replace the API’s and the addon will work on the old client?

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[ZpiX]

Originally Posted by SDPhantom As an official Blizzard community site, discussion involving private servers is prohibited.

Iam more interested in understanding the change that have been made, not talk about private servers (:

I havn’t played since Cata, now I just started a trial account, so I could get back to Lua (Don’t really play anymore)

Edit:
So what have changed since Cata? now we have Retail and Classic and I keep reading "Old client and New client"

"It's updated for patch 3.4.1 now, classic wrath now has to use both the new and old codebase."

What is this New and Old?

I thought that the Classic games were made on the same "updated code" as retail and just "adjusted" around it?

But I can see that Retail and Classic is not the same and the different Classic versions is also different?

Iam really confused and trying to figure it all out

New edit:
Found this: https://wowpedia.fandom.com/wiki/API_change_summaries
I will start reading, just didn't find a summary before (: