Re: So was anything done to Bucky in the first film?
It would be incredibly easy for them to flashback in Cap 2 to Bucky on that table and show him being experimented on to explain how he'd survive the fall and any other possible augmentations to his strength, etc.
I'd say there's a good chance we'll see that.
Phase 1 >>> IM - TIH - IM2 - Thor - CA: TFA - The Avengers
Phase 2 >>> IM3 - Thor: TDW - CA: TWS - GotG - Avengers: Age of Ultron - Agents of SHIELD
Phase 3 >>> Ant-Man - Daredevil - Jessica Jones - Luke Cage - Iron Fist - The Defenders