MacRumors adds some additional details this morning about nano colors and higher capacities:
iPod Nanos are expected to be size-bumped from the current 4GB/8GB sizes up to 8GB/16GB models. As well, Apple will be introducing 9 different colors for each Nano (up from the current 6 colors). The additional colors are expected to be Purple, Yellow and Orange.
AppleInsider adds new details about the iPod shuffle and an accelerometer in the new "tall" nano:
a new version of the iPod shuffle will be made available in 5 colors... The player will reportedly be the first non-Multi-Touch iPod to sport a motion or orientation sensor... the iPod's 'shuffle' function is invoked when a user physically shakes the player. Another person said the new nano would be capable of determining its orientation and provide a more natural Cover Flow view in landscape mode.