All 4 above are in need of test. Integraton of Jitter pluggable compiler interface. Much faster string searches, both case-sensitive and not. A new primitive interface for extending the VM without having to modify it. Look at class InterpreterPlugin and subclasses.
Balloon is a vector graphics engine that brings a new quality of graphics to Squeak.
Note that you can read TrueType fonts or Flash files directly from the FileList. When playing Flash files, use the Morph menu to spawn a control panel so that you can start, stop and change the degree of smoothing. Note that, to an increasing degree, it is possible to take apart Flash graphics in Squeak. See more below. Piano roll display for the MIDI player, and external MIDI output.