https://www.thefirearmblog.com/blog/...on-rifle-line/
Short version is that Sako seems to be favoring the US market. This rifle will not be (initially?) available in traditional European calibers (but no .30-06!?). The largest caliber available will be .375 H&H. The 90 loses the quasi-CRF Sako extractor in favor of a push feed action. There are dual plunger ejectors, an apparent fix of the failure to eject malfunctions they had with longer cases. The ejection port is now smaller and contoured rather like Steyr. Also looks like a redesign of the Optilock bases, but some models have integral Picatinny rails.