The birth announcement for B-15 is at http://www.news.wisc.edu/thisweek/view.msql?id=3834. Other interesting ice and Antarctic links are also on this page.
More pictures and information are at http://uwamrc.ssec.wisc.edu/amrc/iceberg.html.
PS -- Huge bergs are less dangerous than small ones. The big ones are tracked from the moment they are calved while the small ones often go unobserved until a Titanic comes along.
-- Of course it's "north" of the ice shelf. Think about it: if you're standing on the South Pole, you can't see anything but north in every direction, so anything moving away from the South Pole of rotation has to move north. To get an idea where anything is really going in polar regions, you also need to know longitude. As it happens, the Ross Shelf and Sea straddle the 180 degree International Date line (maybe it's tomorrow) and if the berg were to continue straight north (it won't) it would eventually hit Samoa. To see a composite picture of Antarctica, with the site of the calving of B-15 indicated, go to http://uwamrc.ssec.wisc.edu/amrc/COMPOSITE.GIF.