From Nigam Arora in Forbes (a name you can trust to say untrue things about Apple):
It appears that Samsung is getting ready to leave Apple Retina displays in the dust.
Samsung plans to show off a 13.3 inch display with a resolution of 3200 x 1800. This is in contrast to 2560 x 1600 resolution on a 13 inch Apple Retina MacBook Pro. Samsung resolution amounts to an astounding 276 pixels per inch compared to 227 pixels per inch for a comparable Retina display.
Samsung says the new displays will also use less power.