Stainless steel and space black stainless steel cases. The display is protected by sapphire crystal. And a range of bands in three materials.
I’m waiting until things mature a bit, but I think the 42mm is better for me than the 38mm. While Apple products have always carried a price premium, the watch bands take this to a new level. I like the look of the Modern band because it can be worn with the clasp on the top of the wrist and still look nice. But it’s a $200 up-charge and is only available on the 38mm. The other band I like is the Black Stainless Link but it’s a $500 up-charge on either size. Something is wrong when the band costs just shy of the watch itself.