Wrong place? This article is a list of items and styles which have been mentioned for a future version, but not confirmed yet. For a list of confirmed features, see Upcoming Features.

• 1990s (#577) - The transition between Old Aperture and Portal 1.
• Actual 1950s (#549) - Like the 1950s, except nothing is destroyed, like the beginning of PS:M.
• Incinerator (#227) - An incinerator type style like when you go into the incinerator when GLaDOS wakes up. This probably won't be implemented!
• Overgrown Art Therapy (#623) Art Therapy levels that have overgrown. This probably won't be implemented!
• Overgrown BTS (#623) Behind The Scenes in Portal 2 levels that have overgrown.
• Overgrown Portal 1 (#553) Portal 1 levels that have overgrown. This probably won't be implemented!
• TWTM Style (#589) - Takes place in the far future of Aperture, in an alternate universe where GLaDOS was never destroyed, allowing technology to advance ten thousand times more than in Clean Style. This style will resemble Thinking With Time Machine chambers.

• Angled Auto Portal (#650)
• Caged Turret (#629)
• Collectable Point Markers (#495)
• Conveyor Belt Crusher (#653)
• Double Glass Panel (#488)
• Drainable Goo (#584)
• Floating Antlines (#496)
• Grating Holes (#385)
• Grating Mounted Antlines (#494)
• Large Glass Panel (#466)
• Laser Mirror (#576)
• Magnet Field (#656)
• Matter Tolerance Grill (#475)
• Piston Mounted Pedestal Button (#633)
• Piston Mounted Pellet Launcher (#627)
• Player Only Button (#457)
• Pneumatic Cube Spawner (#560)
• Resizable World Portal (#574)
• Small Observation Room (#459)
• Smashed Tiles (#552)
• Standing Placeable Fizzlers (#257)
• Test Chamber Sign (#605)
• Turret Crate (#624)
• Unpaintable Cube (#585)