Yes.. your doubts may be true. Availability of update depends on Product Code / Region. Also if the phone is Network locked, then the update is possible only after an approval from the operator..
Can understand your concern.. but the thing is in most cases, the user think I am the last one to get it. When the latest update for my Nokia 5800xm got released in October..I had to wait and wait and wait..Had a similar feeling then.. but the patience paid and finally I got for my phone too. But, as mentioned..If the phone is Network locked then the wait may be much longer.. or sometimes not fruitful at all..