Upgrade procedure encrypted filesystem (6.4 -> 6.5)

[shadrock uhuru]

hi everyone
when upgrading my laptop which is encrypted with a keydisk
i assume that i boot the 6.5 kernel which will be on a usb stick with
the keydisk inserted,
will the hard drive still be decrypted and upgraded,
also will the encryption step need to be redone or will the keydisk
continue to unlock the 6.5 filesystem on subsequent reboots.
thanks
shadrock