Thanks for this useful message.

Insha'Allah, I am planning to perform HAJ this year by air with my wife (kids are below 10 years, so I don't have any other option than leaving them here)

So far there was no clear announcement provided about the registration opening date at government website for haj.

However, those whom are interested for additional information, they can get it at http://www.hajj.gov.qa/English/VisaCondition.aspx