My guess would be that CO won't start the AKL route until at least after their fourth 787 is delivered. Then when all six 2012 CO 787s are delivered then they will replace the 777 on the IAH-LOS route.
I believe IAH-AKL will require at least 2.5 birds [16 hours out and 13-14 hours return] to do the route, but CO/UA is determined to get the route started as soon as realistically possible.