Thanks ZeitgeistAu, hopefully this time your post will be read twice before being deleted as it's definitely on topic and extremely helpful as support advice for this particular problem.
Apple, I know that bugs are difficult and not always simple to fix. I'd really just appreciate an acknowledgement of this issue, and perhaps a media release or support note advising that the problem is being worked on and that a fix will be available soon. It would also be helpful to advise Apple Support that this problem does exist, so your staff are more equipped to handle it without wasting their time and ours.
Unfortunately my MBA is plagued with problems; yes I get the lock up when it dims to sleep, but it can also just go black and lock up while I'm actively using the computer. I also have the WiFi and audio bugs, so I'm understandably concerned that this issue remains unacknowledged and unresolved.
I can also reporduce the problem by tapping the power key (which in Mavericks initiates sleep, grrrr), and then tapping it or any other key after sleep is initiated to wake the computer back up. This is an issue as I sometimes tap the power key while trying to tap the delete key, and quickly press another key to wake the computer back up. Please note that while this is often a cause for the computer freezing into black screen, it can also happen while simply using the trackpad.