These are the planned features of a future version. Plans may change of course.
Compilation of the same source for multiple 6502-based architectures
Extension system: the language will consist of the core language and optional extensions. Userland extensions can be added, e. g. graphics, sound, i/o, you name it.
Performance: the programs should run even faster and be smaller. There are many possibilities of code optimization yet.
User functions or output parameters for procedures (most likely the latter)
Structs
Possibility to write interrupt handlers - most probably as part of an extension
Maybe a new variable type: long integer. Not sure about this.