Currently booked in economy comfort ATL JNB/RT non-stop. Been checking every day or so to try to move the return seats to bulkhead window. Now, all of the sudden, it appears we are the only ones with seat assignments... all seats are available except for about a dozen of the same exact seats blocked out for outbound and return. Previously there were about 20% (guess) of the seats claimed. I'd really like to grab those bulkhead window seats but I'm afraid something strange is going on and don't want to lose the seats we have.