B17B had broken into two smaller pieces and the larger has survived in the open ocean for about a year. It is expected to break into even smaller pieces as it moves into warmer waters. The ice shelves are not part of the Antartic mainland, they float around the edges of the continent but they more they melt and break up, the faster the glacial ice flows out from the centre of the land/ice mass.
According to scientists the berg is moving at about one knot a day. New Zealand recently issued a shipping alert after a flotilla of icebergs was seen heading toward the South Island but they drifted away to the east. Seven ice shelves have broken up in 20 years due to the warming of the ocean currents around Antarctica. While B17B has been described as a once in a century event now, in the future it may just become commonplace for bergs to be seen this near to Australia.
It reminds me of a novel written by Ken Follett called "Ice" which was a very good read. It seems a shame we have no way of throwing a tow rope onto this chunk of frozen antidote to our drought.