It is bcuz of a g*ddamn pair trade: Samsung vs Apple. Traders took their Samsung profits (due to the release of the new Galaxy S4), now moving that money into Apple. OBVIOUS what is happening here - damn traders.
EWY is closest proxy to Samsung on U.S. stock exchange, it is down. But, the volume and price drop there doesn't match the AAPL increase. So, perhaps not pair trade after all? Perhaps just the fact that the new Galaxy S4 didn't provide much new stuff besides the large screen, i.e. incremental improvement not revolutionary? Or, perhaps it was a pair trade after all, but instead it was INTC+QCOM versus AAPL? (since INTC and QCOM provide components for the Galaxy S4)