Here is a list of changes and improvements that are included in the PLATINUM version versus
the original UFO:

New items to research and produce
+ Medium combat robots Goliath and Gladiator
+ Tank Mortar
+ Tank Laser
+ Firing Accuracy Extender
+ Throwing Accuracy Controller
+ Air to ground sliding bombs

New Alien Species
+ Lobotomic
+ Attenuator
+ Hardened Chaser
+ Hardened Attenuator II
+ Lobotomic Spawn

Other New Features
+ Crash site bombing
+ New avatars
+ New alien mental power

Language localizations

Technical improvements
+ 64 bit support
+ Wide screen