The overall TODO file, for broad plans on the Slate source:

Core

Collections
  Evaluate and make robust the entire hash protocol.
  Add a mixin for collection types that affect or depend on element state or identity. -- PARTLY DONE
  Refactor the system additionally according to the traits additions.
  Implement the whole commonly-known tree types and balancing.

Streams

Graphics
  Tie in the forms system to some primitives based on an existing graphics library.

Compiler
  Finish the bootstrap.
  Finish porting SmaCC as SlaCC.

Optimizer
  Implement register allocator and scheduler along with the MR (machine representation).
  Implement generation of Bootstrap Modules (not self-contained) into IR modules (self-contained).
  Devise representation for image/heap objects in IR modules.
  primitives.slate: generatePrimitive: #multipleValues and others lines with #

MOP
  Support different slot types.
  Support open points at method-invocations, and aspect/perspective support.
  Support different methods of inheritance and implementation, to handle
	things like safety of composition of delegates, a la Smalltalk Traits
	effort.
  Hook it into the bootstrap for efficiency and compilation.