I'll quote my list again.
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"80's Filter": Removed for being system-intensive.
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Camp Omega Special Mission (E3 2013 Trailer): Unused for unknown reasons.
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P.T Active Decoy ("Lisa") (2014 TGS gameplay presentation): Presumably cut for relationship to the cancelled "Silent Hills" project.
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Missing Delivery Point Invoices (missing locations?): Removed for unknown reasons.
- Usable Battle Gear during free-roam (Piggyback Collector's Edition strategy guide): Removed for balance reasons.
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"Burned/Skull Boss" Model (Kojima 2015 Launch Trailer): Unused for unknown reasons.
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Africa Burning Village Cutscene (E3 2014 trailer): Removed for unknown reasons.
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Africa Child Soldier Training Cutscene: Unused for unknown reasons.
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TGS 2014 Africa Mission (TGS 2014 gameplay presentation)
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Mission 46 Unused Dialogue (found in game files)
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"Mission 51" Unused Mission (found on CE Blu-Ray disc)
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Unused/unknown alternate costumes from the leaked script, including "Foxtrot". "Sandstorm", "Realtree", "Panther", "MGS3 Naked", "MGS3 Sneaking" and "MGS3 Tuxedo", along with buddy uniforms like "Horse_Parade" and "Horse_Western". Removed for unknown reasons.
For reference,
there were some text files in Ground Zeroes that seemed to hint at content in TPP that never showed up either, including several weapons like a Machete, AK102, Mosin Nagant, SCAR and M4. A Machete Key Item can be collected in TPP, but it's a weapon for D-Walker.