New Apple Macbook Air in stock now
See the graph on the left which shows how the new 13″ lasts for 12 hours as opposed to 7 hours before the update.
Other major improvements are more and 45% faster flash storage, Intel’s new “Haswell” processor, 40% faster integrated graphics and a new WIFI chip (802.11ac) that is said to be 3x faster (if you have a similarly fast base station).
After 1 year without an update it was about time for this refresh. And the stuff is in stock while it lasts (probably not long):