Office and Explorer were actually shown in some other videos today, they've been updated to the new UI theme as well. As have paint/notepad. Edge as well, that combined with the Taskbar/Start menu and Store they demoed in the main video. Settings has also been completely restyled to match the new theme, don't remember which video(s) that was in though. The new Terminal (which can now replace command prompt as the default terminal for applications too) seems to fit in visually too.

Overall I don't think every Microsoft app ever made is going to get a facelift but it really seems like all of the main user facing apps have actually been updated together for once.