atishaATC
After you have taken a stage test, the Gtios system doesnt say anything new until you are invited to book the next stage. It does sound strange that people on 2/3 july have their results before you, but the same thing happened to me. I know they say to wait the 15 working days before you contact them but a 1 liner via the message centre im sure wont hurt. I found the message centre was the easiest way to contact them.
On the swap over to the new system it looks like, if you started on the GTIOS system then you will complete using that, new applicants will be on the new system.