Well lookie here, I found this on Reddit:
Things that stand out:
- Some Terran starport unit called "Spy Satellite"...Looked like a Widow Mine
- Better picture of all alpha units
- Alpha Siege Tank design, both deployed and undeployed (looks REALLY SICK!)
- Science Vessel started out as an air unit early on, became a land unit, then again an air unit in beta.
- Terran Marines (called "Marauders") were actually not wearing power suits back in really early alpha
- Command Center in the early alpha looked like an old, rusty Comsat Station
- Cleaner, sharped, clearer picture of all the Terran buildings, including the alpha and beta ones that were removed afterwards.
- Protoss could build Pylons on water! (Reminds me of the abandoned "Water StarCraft/Aqueous Rift" mod)