We won't be able to tell until we see in person. It's likely an EXTREMELY light Grey -- enough to not be a frankly garish and slightly out-of-date "Apple white"
For instance, the bezels might be (in HEX color code, sorry it's all I know!) #fafafa, which is 98% as white as #fbfbfb (true white). #fafafa is the second shade from the left in the photo below. The top and bottom are true white for reference.
View attachment 1767060
You might think that distinction is inconsequential, but I imagine it makes a world of difference, albeit a subtle one, in day-to-day use. We'll see! Either works for me (though off-white might be the future proofed choice, from a design stand point)
I really agree... they've implied the design choice was to update iMac as a component of modern interior design. Meaning a more natural, light palette with pop of color and distinction. It's been the case for a few years now. I think we really need to dig into the history of Apple design and how heavily influenced it was by classic design stalwarts like Braun and Dieter Rams, among others, all of whom viewed technology as needing to fade from view and really become
a form of furniture.
Now, these colors don't really suggest a "fading into background" approach until you look at them in the context of modern millennial and gen-Z design trends. Then you realize that a computer with a cold, boring, black and silver scheme would actually stick out WAY more than a pastel red iMac would.
Based on the success of the iPhone XR/11/12, it's clear people want as much color as possible, and gone are the days of stuffy black-heavy, monochromatic technology. People on here will disagree because they're a specific type of Apple/tech user, but for the greater part of the Apple community, the unsung desire for lighter, cheerier tech is finally being heard.
Personally, I have to think about how my studio is off-white walls, a few shades of wood, and a bit of muted green with lots of plants and sunlight... it's all harmonious. Until you get to huge black TV. It sticks out like a sore thumb. I want something that'll fit into my general design choices, and a white bordered TV/iMac would be exactly what I need. I'll be getting one of these iMacs, likely in green or yellow, and eventually I'll likely get a Samsung Frame/Serif TV that allows for the color palette I need.
Sorry for the tangent