My only reasonable though for this is a "huge boost in performance". As the "i" is going to gone and the Ultra(this naming needs a bit changing) is coming, i kind of can accept it, if it's like this:
Core i3-13100 get to Core Ultra 3 1330(Blank,K,F)
Core i5-13500 get to Core Ultra 5 1350(Blank,K,F)
Core i7-13700 get to Core Ultra 7 1370(Blank,K,F)
Core i9-13900 get to Core Ultra 9 1390(Blank,K,F)
Laptops get the "same" polish with:
Core i3 get to Core Ultra 3 1335H
Core i5 get to Core Ultra 5 1355H
Core i7 get to Core Ultra 7 1375H
Core i9 get to Core Ultra 9 1395H
Intel has a damn lot of cpus even in the same generation with some minimal or a lot of difference in performance though both are right now i5 or i7. I hope it's not going to be like Apple's Base/Pro/Max/Ultra because that naming is dumb. If it goes to that than i propose a new naming as i3=Copper, i5=Iron, i7=Gold, i9=Platinum.