+There have been a few visible and some not-so-visible changes. On the
+visible side we have better visual feedback regarding the structure of
+a formula, showing the nesting by small purple decorations in the
+formula itself and revealing the names of the nesting levels in the
+minibuffer. There is now native support for symbols from the wasy
+package containing e.g. the zodiac symbols. New also is the internal
+structure of font changes which are now proper "insets", just like
+anything else from a square root to an array. This not only simplifies
+the code greatly but also allows the same editing tricks as for the
+"regular" math. However, it was not possible to tweak the visible
+behaviour to mimic 1.2 in all cases, so this might take some time to
+get accustomed to. On the pro side, the new structure allowed
+support for LaTeX's \mbox and \fbox to be implemented and general
+"switching back to text mode within math", so a lot of "evil red text"
+trickery is not needed anymore. The most visible changes are the following:
+
+- Pressing { and } will insert LaTeX's \{ and \} which show up as { }
+ in the printout. To get LaTeX's {} nesting, you need to type \{.
+
+- Fonts changes now really nest. Repeated application of a font change
+ will result in nested font changes! To remove a font change without
+ removing the "contents", it is now possible to "pull the argument"
+ like in other insets, i.e. put the cursor in the first position of
+ the inset and press 'backspace'.
+
+** Reading old files
+
+LyX now has a new script lyx2lyx which enables the reading of any file
+produced by LyX versions as old as 0.12. Work is in progress on files
+created with LyX 0.10 (LyX 1.4 time-line) and still older files are
+in the forge. Basically if lyx wrote it LyX will read it. :-)
+
+There is also a strong demand to be able to read files produced by
+_newer_ versions of LyX. While lyx2lyx has the infrastructure in place
+to do such things, the filters to `downgrade' LyX files (from 1.3.0 to
+1.2.x, for example) have not yet been written.