ps. it says heat stroke is implemented, but it doesn't show up in searches so there might be something wrong there
escplan9: Ice Cave and Equilibrium are already done and should be available. Heat Stroke and Lethal Vapors were implemented but not released until v5 which is out now! To clarify - "it" must be referring to the Card Implementation Tracker. That one is manually updated and unreliable to provide accurate information. Just search in game using Deck Editor.