- The wsgiref package has been fixed for 3.x.
- A few hideous bugs in the new IO implementation have been squashed. In addition, a few cases have been optimized. (Note that IO in 3.x is still quite a bit slower than 2.x; more on that later.)
- Unbuffered standard streams (the "-u" flag) have been restored.
This is actually a bit more than an average point release. Somehow, the builtin cmp() and __cmp__ slipped into the final release and has been removed in 3.0.1.
Our next goal is 3.1. We plan to compress our rather huge release cycle to make 3.1 between 1/2 and 1 year after 3.0. The focus of 3.1 will be stabilizing the feature set and change in 3.x. This is includes the rewrite of IO in C for speed and Brett's rewrite of import in Python.