Only once those 15.6" screens are actually available. If they release 15.6" 16:9 in the next couple of weeks, you're looking at 1366x768... which at least to me is too low.
Of course, as has been suggested, they might be going up in size to 16.4" and 18.4"... which solves the resolution issue, but means considerably larger notebooks.
How do we know that these panels haven't already been requested by Apple ahead of time and are already in production?