The 12 teams of the NPB decided that they will begin providing explanations of the problems with current pension system to 829 retired players (the group includes players that are currently receiving benefits and players that are on hold for the benefits) beginning in early July.
The biggest problem with the current system is the expiration of the tekikaku taishokukin seido (適格退職年金制度) in March 2012. This particular law essentially allows companies (in this case the NPB) to create pension systems by investing in various funds. What's more, pension systems built around this law were also eligible for special tax breaks.
The current pension system is also running low on funds, causing financial strain on the NPB.
The NPB is ultimately hoping to pay off players currently receiving money through the pension one-lump sum.