Will Sonos work with Luma wifi?

According to the website it's using 2.4 and 5ghz, so it's just as likely to interfere with Sonos as any other 2.4ghz WiFi. Whether luma is smart enough to avoid that is unknown. Presumably you could connect Sonos to the Luma ssid as you can any other wireless network, in which case it wouldn't matter.

$199 for what is basically a router though...

No, for $299 you get 3 routers that create a mesh wifi network for your house, similar to the way Sonos creates its own network. I'm assuming a mesh wifi network will work just the same as only using your one wifi router.

The "normal" price for one unit is $199, says so right there on the website. They're doing an introductory offer of $149 at the moment but it's still a lot.

Interesting find and if it can do a better job of entire home coverage compared to what repeaters can do today, it ought to be very useful, doing for WiFi what Sonos does for audio. Someone from Sonos ought to have the answers to the interference question and clarify it here, hopefully.

Equally interesting is the question: can Sonos can use that mesh running in WiFi mode, doing away completely with the need for a wired to the router unit as is recommended when the WiFi approach doesn't provide stable music play? As a corollary, no need then for Bridge/Boost units either?

That is an interesting question, one I didn't think of. I already have 2 wired Sonos units on opposite ends of my house so that works great, but my wifi is not so great. I feel this is a product that has been a long time coming and I really want to try it out.

Getluma.com
click preorder and its $299 for 3. The price will increase once it is released.

I can read you know. I know that but if you only want one, the "normal" price is $199. That seems expensive.

Calm down.. Yes it does, but to get the full benefit of the product you'll want more than one. If 3 aren't enough to cover your entire house, you can add a 4th for $199. I wouldn't buy just 1.

Well that's partly my point, I buy three for $299, decide I need another one and then have to shell out $199 for it? Crazy...

A wifi mesh will be on a different frequency than the Sonos mesh, right?
Looks architecturally similar to eero. No relevant FAQ that I could locate so channel usage for the mesh is presently unknown. (The last time I looked, eero used a fixed channel 1, 40MHz wide, at 2.4GHz.) Any user of the 2.4GHz band obviously has the potential to interfere with SonosNet.