What is Enduro?

Check out DCR - if he talks about a device, it's been announced.

Ok, so it is live, but where is it in the simulator? Do I just build for F6X and assume it'll be ok?

Looks just like the f6x CIQ wise, in which case it's probably been auto migrated.  And if you update an app today, you'll lose that auto migration.  

expect an update to devices in the next few days.

Yes, there was an auto-migration:

Enduro is now available for download in the SDK Manager.

Thanks,

To be clear it's not equivalent to a 6X as it doesn't have any of the "pro" features such as maps, music or wi-fi.

TL;DR it has the screen of a 6X with the features of a 6, as far as I can tell.

https://www.dcrainmaker.com/2021/02/garmin-enduro-gps-watch-in-depth-review.html

First though, you need to decide whether you want to sacrifice non-battery features for battery life. Remember, this isn’t a Fenix 6 Pro series watch, and as such, you lose all the following features:

– No Maps (nor Trendline/heatmap routing)
– No Music
– No WiFi sync
– No PacePro on the fly (since that requires maps), but you can do PacePro based on a course
– No ClimbPro on the fly (since that requires maps), but you can do ClimbPro based on a course

The Enduro does have the same screen size as the 6X (280x280), but all the memory limits are the same as Fenix 6, from looking at the CIQ device library info (compiler.json).

Having said that, I'm surprised that it would auto-migrate for anything other than a simple data field (or even that). None of my apps (simple data fields, complex data fields, widgets and device apps) seem to have been auto-migrated. (Didn't check all of them, but just a representative sample)

32K memory limit for datafields is quite restrictive

Can't argue there. And lots of current-gen devices, including Vivoactive 4, have this 32 KB limit.

What's worse is trying to support older devices which only have 16 KB for datafields.