The World has known of melting polar caps for a good many years. However, these new studies are from direct scientific observation of the ice changes, and not computer modeling. It's no longer climate conjecture. Interesting to hear scientists address fine points of language to describe ice cap changes, such as preferring terms like "unstoppable retreat" but avoiding the word "collapse". Also fascinating to hear science journalists press their questions - example starting at 56:00 . Such as asking do "carbon emissions have the effect? ...or is it a natural process ?" In their convoluted answer, climate scientists show their lack of media savvy - missing is a short, clear answer.
The NASA video press conference is Q&A with major media, scientists talk over visual graphics:
A quick summary video shows it is inexorable, like a melting frozen water clock. Water moves down to the sea. But we don't know how fast and how soon.