1) There is a new site-wide configuration variable called maxbytes,
which provides an upper filesize limit for all (student) uploads.
2) There is a new course-level variable called maxbytes, which further
limits uploads within a course.
3) There is a new maxbytes field for forums, which further restricts
the size allowed in a particular forum. There is also a new config
variable in the module configuration to specify a default size
to use when defining a new forum.
4) Assignments already had a limit, but this is now aware of the other
limits, and like forums there is now a settable default value.
5) Finally, the sizes of files (Gb, Mb, Kb, bytes) is now translatable
in the language packs.
