A nice description of what will take place, straight from the PPV's own wikipedia page
Battleground features professional wrestling matches that will involve wrestlers from pre-existing feuds, plots, and storylines that play out on WWE's primary television programs, Raw and SmackDown. Wrestlers will portray villains or heroes as they follow a series of events that build tension and culminate in a wrestling match or series of matches
Well, I'm sold. In case you aren't yet, here is the card.
Daniel Bryan vs Randy Orton
Vacant WWE Title

Alberto Del Rio vs Rob Van Dam
World Heavyweight Title
Battleground Hardcore Rules

CM Punk vs Ryback

Cody Rhodes & Goldust vs Seth Rollins & Roman Reigns
Jobs for the Rhodes brothers if they win, no WWE job ever again if they lose.

AJ Lee vs Brie Bella
Divas Title

Curtis Axel vs R-Truth
IC Title

Ziggler vs Sandow
Pre Show Kickoff

Bray Wyatt is likely to have a match also.