https://www.apple.com/newsroom/2022/06/apple-unveils-m2-with-breakthrough-performance-and-capabilities/
Changes comparing to M1 are as rumous expected.....
The same amount of CPU cores and small uplift in CPU performance. My guess is that it is mainly by using higher CPU clock and just slightly by CPU architecture improvement. (My guess is based on the performance vs. power draw graphs for M1 and M2.) So, most CPU improvement is due to movement to 5 nm advanced process of TSCM, not due to Apple's desing improvements....
Apple has focused on GPU power improvement and AI improvement. Also faster RAM is used which helps mainly GPU performance and probably also AI performance...
Comparing M2 and Intel is funny. Comparison of M2 with AMD CPUs would not be so chocking... ;-)
There will come AMD Zen 4 CPUs in few months. They are on similar (5 nm) process like M2, so comparison will be more fair than M1 (5 nm) vs. Zen3 (7 nm)...
Lets wait.... AMD CPUs will draw more power than M2, but for sure not 4x more like Intel in Apple marketing presentation.... ;-) (Current AMD models draw twice more than M1, or so...)