Publisher Take-Two Interactive today officially confirmed that a sequel to 2K Boston and 2K Australia's underwater shooter BioShock will arrive during the company's fiscal fourth quarter in 2009. Take-Two's fourth quarter runs from August through the end of October. BioShock 2 is under development by the Novato, California-based studio 2K Marin. The new development house is rumored to consist of several former 2K Boston and 2K Australia employees.