Same thing happened to me. The guy on the road show was the same guy who interviewed me in Doha.
Got told I had a job after 5 weeks at the same time I was sent an official offer of employment letter which had to be signed and sent back. I was also given a fleet at that stage as well. Then I was told it takes 3 weeks for my visa after which I would be given a start date. I guess each candidate is different.
Tug