I think you'll find a 6th 777 option will be taken shortly
Actually, I think you will find that A/C 6 & 7 are not options, but firm orders that was deferred during the GFC. In addition to the 7 firm orders, VA have a total of 6 options that may (or not) be exercised. The ETIHAD tie-up increases the likelihood of these options being taken up - we are all waiting with baited breath