DS1821+? Any new 8-bay synology's coming out in the near future?

[ed]

Yes, you can almost always migrate drives from an older NAS to a newer NAS. Especially if it is the same kind of NAS - same category like plus series or value series.
Group 1: Armada370, Armada375, Armada38x, ArmadaXP, Comcerto2k
Group 2: Armada37xx, rtd1296
Group 3: Apollolake, Avoton, Braswell, Broadwell, Broadwellnk, Broadwellntbap, Bromolow, Cedarview, Denverton, Geminilake, Grantley, Purley, R1000, V1000, X86

Group 1 => Group 1 / 2 /3 = OK
Group 2 => Group 2/ 3 = OK
Group 3 => Group 3 / 2 = OK

https://kb.synology.com/en-ph/DSM/tutori...nchor_id22
https://kb.synology.com/en-uk/DSM/tutori...y_NAS_have