ere a newer Inside release beyong 10586.494 for Lumia 820?

My Lumia 820 (1GB) is running on Insider 10586.494. I haven't seen any further updates available for some time.
Is this the last release available for the 820?

Also, will I be able to keep Win 10 running via Insider in the long term? ie, will it die and force me to go back to 8.1??

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