If there were any unreleased songs left from this session they would have used it for the CD/5.1mix release I think. Code against the Code was specially recorded for the Deliberation single so not even this is from the TGCD session anymore. Or Peaceville holds the opportunity to re-release some Katatonia material in time where they use unreleased material to sell (more) copies.
Maybe they are concentrating on new material for a new album now. Btw, will the next album be the last one for Peaceville? I heard of a 5-record deal they signed with Peaceville and number 5 would be the next and last in line so far. (TD -> LFDGD -> VE -> TGCD -> new album -> ???)