Will Unsecured Rejoin (TC Rejoin) still be allowed in Zigbee 3.0?

No. In Zigbee PRO stack r21 and Zigbee 3.0, TC Rejoin (or Unsecured Rejoin) using the default or well-known link key will no longer be allowed. It will only be allowed for devices that have completed successful link key exchange, where they receive unique link keys.

See Zigbee PRO Stack r21 specification (05-3474-21), Table 4.33 Trust Center Policy Values, attribute allowRejoins.

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