Yeah, I'm pretty sure you have about a week to join since they want feedback through surveys and the Samsung members app. I'm pretty sure there's no way to opt in at this point since next release will be in about a month most likely, the final version with the December security patch. I could be wrong.
Thanks for the response. Providing more feedback is really the reason I wanted to get a second device into the program. Like I said, I'm already opted in, just wanted to get a second device in. I guess I just have to wait.
