Bluetooth Mesh, which was recently adopted by the Bluetooth SIG, is not part of the Bluetooth 5.0 specification. Instead, Bluetooth mesh is a standalone ("External to Core") specification that utilizes the BLE Advertising channels defined in the original Bluetooth 4.0 LE specification to 'flood' messages across the mesh network. TI intends to support Bluetooth mesh in a future product offering.
To keep up on the latest status with mesh offerings from TI, we recommend subscribing for wireless connectivity updates in your myTI account.