We found out a few days ago that His Dark Materials would be heading over to SDCC. We've also found out that both the release dates and a new trailer will be shown! (src - find original Instagram post here)
Hopefully, they'll broadcast the whole panel Q&A on the Twitter account - and release news on the release date and trailer there.
The panel will be on 4:45-5:45 San Diego Time, so make sure you convert that if you want to catch up with the news. For BST, that's at 12:45-1:45am (oh great). This is looking promising!