The cost might go up significantly if they’re actually hosting the .torrent files. They could save space and bandwidth by only hosting the magnet links like The Pirate Bay did.

The X Window System (aka X.Org or X11) has been the default window system in many distros. Recently there has been a new window system called Wayland, so the joke would be that Debian is dropping X11 and switching to Wayland.

Start playing it as soon as possible.

We can’t say anything else about the game without spoiling anything, so it’s best to avoid spoilers and just start playing while you have the chance to go in blind.