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.)
A lot if not most of the talks will be recorded, yes.
All talks will be recorder unless the speaker(s) don’t want it to.
> but it starts at 4 AM for me.
It ends at 1am their time. The conference itself never stops there are people there around the clock. (I wish I could go!! I went to 28c3 in Berlin and 29c3 in Hamburg they were amazing)
Edit: the youtube playlist for 38c3 seems pretty comprehensive. Thanks to whoever is doing that, it must be a pain.