You will have to wait until Samsung announce if there is going to be a beta yes or no. and iff there is gonna be a beta ur gonna know and make sure ur the first to sign-up because its limited. exact date i dont know.
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Not sure if the Note 10 is going to get the beta. From years of past experience, the Beta opens to the newest S series first and then the newest Note series ( in this case, the Note 20 series). And that's it before they start pushing out the official update. I've participated in the last 4 betas so I hope that helps