I not excited. Partly my currently M3 iMac which I bought in Feb 2024 starting to have lines suddenly appear which quite a lot M series iMac users encounter upon using it for one year + haven't even reach 2 years or so Lines appear. 
There are evidence due to the M series iMac design inside. You can simply just google around there. I not say hardware experts. Summary is the M series screen and display ribbon etc can easily over heat. In order to replace have to change the entire screen too. According from that tech person. He mention why a lot report there are lines suddenly appear upon using for one year so coincidence partly due to this. He mention even one go replace the screen, the Lines problem will come back after One year of usage. 
You know is a a stick put at a fire slowly pull into it , eventually the stick already gone like that. DO note I love using Apple products. I not rant here. I even owned other older iMac EPIC the screen at least still ok , at least don't have lines but do have pinkish hue or burn mark if watch Youtube video or stream for sometimes but eventually it will fade off at least. Next this old intel iMac already use for years. I bought it at 2015 still working, now next to this M3 iMac I typing now.   
I have to see the design the " casing of this iMac but I feel will be the same just like M1 to M3 iMac. "