http://wxwidgets.org/develop/roadmap.htm

This page represents current thinking about where wxWidgets is going in the near, medium and long-term. It also serves as a schedule for new releases so that both developers and users can know what to expect when, at least approximately.
Note: In the following, the term 'stable' refers to a tested release from the stabilised branch. 'Unstable' or 'development' does not mean that the release will fall over a lot (although it might), but refers to the fact that backwards incompatible API changes can only happen in the unstable branch and so you should be ready to update your code if you are using development version.
We have adopted the Linux kernel style of numbering system where odd minor version numbers are development versions, and even numbers are stable versions. For example, 2.5.x are development releases, and the next 'stable' or final release of it would normally be 2.6 (or 3.0.0 if incrementing a major version).
Note that since much of the wxWidgets effort is voluntary, these are not hard-and-fast deadlines: but we will endeavour to follow them as closely as possible.
Please see the Todo List for the list of other items which may appear in the future wxWidgets releases.
Schedule

Release	Type	Scheduled	Released	Tag	Description
2.4.0	Stable	1/2003	2003-01-06	WX_2_4_0	This was a stable release.
2.4.1	Stable	2003-03-01	2003-06-13	WX_2_4_1	This was a stable release.
2.4.2	Stable	2003-09-20	2003-09-23	WX_2_4_2	This is the last releases in 2.4 branch. It was purely a bug-fix release.
2.5.1	Development	2003-09-30	2004-02-23	WX_2_5_1	This was an unstable release.
2.5.2	Development	2004-06-01	2004-05-31	WX_2_5_2	This was an unstable release.
2.5.3	Development	2004-10-17	2004-10-11	WX_2_5_3	This was an unstable release.
2.5.4	Development	2005-02-01	2005-02-24	WX_2_5_4	This was an unstable release.
2.5.5	Development	2005-04-03	2005-04-03	WX_2_5_5	This was an unstable release; the last before 2.6.0.
2.6.0	Stable	2005-04-10	2005-04-21	WX_2_6_0	This was a stable release.
2.6.1	Stable	2005-06-01	2005-06-03	WX_2_6_1	This was a stable release.
2.6.2	Stable	2005-08-01	2005-09-20	WX_2_6_2	This is the latest stable release.
2.6.3	Stable	2006-01-10	2006-03-25	WX_2_6_3	This is a bug-fix release in the stable branch.
2.6.4	Stable	Early 2007	2007-03-21	WX_2_6_4	This was the last release in 2.6 (old stable) branch.
2.7.0	Development	2005-12-01	2006-08-06	WX_2_7_0	First release in new development cycle.
2.8.0	Stable	2006-12-11	2006-12-12	WX_2_8_0	First release in a new stable branch, main new features are AUI and richtext libraries; new wxAboutBox, wxAnimationCtrl, wxCollapsiblePane, wxComboCtrl (and related), wxHyperlinkCtrl, wxPickerCtrls, wxTreebok classes; new wxDFB port and much more.
2.8.1	Stable	January 2007	2007-01-15	WX_2_8_1	Important bug fixes for 2.8.0, no new features.
2.8.2	Stable	February 2007	2007-03-13	WX_2_8_2	More important bug fixes for 2.8.1, a few new minor features.
2.8.3	Stable		2007-03-21	WX_2_8_3	More important bug fixes for 2.8.2 and a few other problems, no new features.
2.8.4	Stable	May 2007	2007-05-18	WX_2_8_4	More important bug fixes for 2.8.3 and a few other problems, no new features.
2.8.5	Stable	Sept 2007	2007-09-10	WX_2_8_5	More important bug fixes for 2.8.4 and a few other problems, no new features.
2.8.6	Stable	Oct 2007	2007-10-01	WX_2_8_6	Fixes for a bug in 2.8.5 and a few other problems, no new features.
2.8.7	Stable	Early 2008	2007-11-27 (earlier than planned!)	WX_2_8_7	Several bug fixes for all ports, add support for reading alpha data from TIFF files, wxAUI, wxGraphicsContext and wxRichTextCtrl improvements.
2.8.8	Stable	March 2008		WX_2_8_8
2.10.0	Stable	never		WX_2_10_0	This release probably won't exist, the UTF-8 changes are extensive enough to warrant a new major version.
2.9.0	Development	April 2008		WX_2_9_0	First appearance of UTF-8 build mode and many other new features.
3.0.0	Stable	end 2008?		WX_3_0_0	New UTF-8 build mode, in addition to the existing ANSI and Unicode. Even better STL interoperability. Deprecation of some old components.