The Extreme Sport Apple Watch Series 8 will have a larger screen than the standard Series 8.
@ShrimpApplePro also mentioned that the Apple Watch Series 8 will enter mass production this month without adding new sensors. The aluminum case Apple Watch Sseries 8 will be available in Midnight, Starlight, Silver, and Red. The stainless steel version of the Apple Watch Series 8 will be available in Silver and Graphite. Compared to the Series 7, the Series 8 has fewer color options.