If DIA means the old airport before Hamad opened, there was a completely separate terminal there for First and Business passengers. Some still reminisce wistfully...

But I don't know what state the facilities there might be in these days. No doubt both the State of Qatar and QR themselves will be wanting to make sure they give all of the likely first time visitors a good impression though.

Where have you seen this? Will it be certain types of flights using that airport? (eg. charters,)