The 5th Freedom Edition is exclusive to GAME in the UK and GameStop in Ireland, and comes with a Sam Fisher figurine, Splinter Cell Echoes graphic novel, two co-op maps, and some in-game gear, all in a steelbook case (well, except for the in-game items that exist only in a digital state).
The 5th Freedom Silver Edition, exclusive to Uplay, is like the other 5th Freedom, but with a fancier steelbook and a silver Sam Fisher.
The Ultimatum Edition comes with a digital watch, a shorter selection of Splinter Cell Echoes, and a bit less unlockable gear, along with a really silly name. Finally, the Upper Echelon Day 1 Edition comes with a bunch of digital stuff: the maps, some gold goggles, the "legendary Upper Echelon Suit," and more. It's exclusive to GAME in the UK and Xtravision in Ireland.