The following changes have been applied to the installer at http://www.autohotkey.com/download/
Improved FileCreateShortcut with options for: 1) using an icon other than the first; and 2) setting the launch state to minimized or maximized. [thanks Holger] If you happen to have any scripts that use FileCreateShortcut with Ctrl-Alt-Comma as its shortcut key, ensure that comma is escaped.
Improved memory conservation: If a script requires its temporary memory area to be greater than 4 MB for an operation such as "StringReplace, Huge_Var, Huge_Var, `n, `r`n", that memory will be freed automatically when it has been unused for 10 seconds. The 10 second delay avoids the performance penalty of frequently freeing and reallocating memory. For example, a loop with thousands of iterations might need the temporary memory area for its entire duration.
Added built-in variable A_YWeek, which is the current ISO 8601 year and week number. [thanks various]
Added the following built-in variables: A_Language, A_ComputerName, A_UserName, A_Desktop, A_DesktopCommon, A_StartMenu, A_StartMenuCommon, A_Programs, A_ProgramsCommon, A_Startup, A_StartupCommon, and A_MyDocuments.
Added command FileGetShortcut, which retrieves information about a shortcut (.lnk) file, such as its target file. [thanks Holger]
Added command FormatTime, which transforms a YYYYMMDDHH24MISS timestamp into the specified date/time format.
GUI: Fixed tab controls so that keyboard focus always lands on the first control rather than the second when the user clicks on a new tab. In addition, the Ctrl-PgDn/PgUp/Tab navigation keys will now work when focus is on a ComboBox. [thanks wkueting]
GUI: Fixed "GuiControl +/-Options" so that the Check3 style can be added or removed on Checkboxes. Also, controls are always redrawn when their styles change. [thanks beardboy]