Starting Anarki at the command line hasn't changed if you're using the "arc" script. If you're invoking boot.scm yourself (e.g. if you're on Windows like me), the command has changed a bit.
Before:
$ racket -f boot.scm -e "(tl)"
After:
$ racket -t boot.scm -e "(tl)"
Unfortunately, the Racket package builder wants to compile every .scm file it finds in the file tree, and it expects all of those to have a #lang or a (module ...) form surrounding the whole file. I had to change boot.scm to make that work. I tried several ways to make "-f boot.scm" work, but "-t boot.scm" was the closest I could get.
