This rumor is a load of rubish!
Sony already have 16 studios in thier firstparty stable. They have no reason to buy Epic or Deep Silver.
Also, if they really wanted a new studio so bad, they could easily just open one thierselves rather than spend a wad of cash to buy out an already exzisting one.
Besides, its not like Sony is in a position to be making big aquizitions anyways. The PS4 may be doing well, but as a whole, Sony is bleeding money.