The 404.html template does not show like it used to when devMode is set to true. I am not sure that this is a problem, but it's a difference that took me a bit to figure out. Seems like there should be a way to see it while in devMode. Thanks!
This changed in Beta 7:
UserException
reports are now styled like other exceptions when Dev Mode is enabled, with the full stack trace shown.
You can see your 404 template by requesting it directly, e.g. http://mysite.dev/404
Most helpful comment
This changed in Beta 7:
You can see your 404 template by requesting it directly, e.g.
http://mysite.dev/404