All talks will be live streamed, and right after the talk is done you have a rough cut available instantly under "re-live" you can watch until the final recording is available; https://streaming.media.ccc.de/39c3/relive
I should note that some talks will not be recorded, and only available at the congress. These are clearly marked on the congress hub website, but not easily available on the fahrplan view.
Yes. They record almost every talk. You’ll find the relive (unedited recording of the live stream) on https://media.ccc.de and some time later the edited recording also on media.ccc.de and also on YouTube.
There also also live translations to English (and some other languages) for talks in german.
Probably. In previous years there were streamdumps available immediately somewhere (though figuring out where took me usually a day or so) and a re-live version on media.ccc.de a bit later. (Usually hours, but from time to time a day or so.)
All talks will be live streamed, and right after the talk is done you have a rough cut available instantly under "re-live" you can watch until the final recording is available; https://streaming.media.ccc.de/39c3/relive
The final recording will appear under a day or two after the talk is held: https://media.ccc.de/c/39c3
EDIT: A different variant of the schedule with better filtering is available here: https://events.ccc.de/congress/2025/hub/en/schedule
I should note that some talks will not be recorded, and only available at the congress. These are clearly marked on the congress hub website, but not easily available on the fahrplan view.
Are there any talks whose speakers are known for their expertise that one should pay attention to?
Edit: the youtube playlist for 38c3 seems pretty comprehensive. Thanks to whoever is doing that, it must be a pain.