OSN has announced it will add up to five high-definition channels this year as part of its plan to make the network 'HD-only' by 2015. "We will continue to expand over the next two or three years, to convert the entire platform offering to HD," said David Butorac, chief executive at OSN. Last week, the pay-TV network announced it had added MBC's seven high-definition channels, including MBC1 and the Al Arabiya news station.