I think it'd be a good idea to have a list of features proposed and/or under active development, along with the milestone they will hopefully be released with. An example is the new binding/event architecture will almost surely be going in, but will not be released until the 2.0 release series. "Simple" profiles will are also being developed and should go in 1.0 (AFAIK).
By the way, this is for core features, not plugins.
Edit: I know I arbitrarily assigned targets to these even though I'm not a project leader. For features I want to get in later versions, esp. 2.0, there is plenty of time to talk about them later.
I'll start with what I'm working on or interested in:
Topic: Rectangular (block) selection operations in wxScintilla.
Status: Completely broken in SVN head (1499), patch available for some of the operations.
Target milestone: 1.0 final
Topic: Compiler options (edit: this is a plugin so it can happen anytime...)
Status: Pretty complete as is, some advanced options to go
Target: 1.1 (first minor update after 1.0)
Topic: New advanced options in project files
Status: I haven't even posted details of what I mean
Target: 2.0
Topic: Completely revamped bindings/events architecture (not just the key binding plugin)
Status: A few discussions on the forum
Target: 2.0