I wanted to explore this matter further and so asked on the AVforums. Here is one of the replies.
'Auzentech are currently developing a HDMI 1.3 card for DTS HD and True HD, press release is in June, Card should be released in July.
Here is the response to a ticket i raised on their site
Please do not reply to this email
Ticket Subject: HDMI X-Tension
. . . . . . . . . .
Here is the last response to your ticket:
Dear David,
Thank you for contacting Auzentech.
We are developing the Auzen X-Tension HDMI 1.3 continuously.
We will press-release in June 3th and release in July.
You will be able to get the exact specification at that time.
We appreciate your support and patience.
Sincerely, '