[v1.1] update ANNOUNCE

ANNOUNCE

@@ -7,17 +7,52 @@ The announcement text for ksh 93u+m/1.1 is under development.
 
 ### MAIN CHANGES between ksh 93u+m/1.0.x and 93u+m/1.1.0 ###
 
+New command line editor features:
+
+- In the emacs and vi line editors, the PageUp and PageDown keys now perform
+  a reverse search and backwards reverse search based on the current line.
+  The arrow-up and arrow-down keys now act like PageUp and PageDown, unless
+  the new --arrowkeysearch option is turned off (see below).
+
+New shell language features:
+
+- The 'time' reserved word now outputs timings in a precision of 3 digits
+  after the decimal point if the TIMEFORAMT variable is not set. See also
+  TIMEFORMAT under 'New features in shell variables' below.
+
+New features in built-in commands:
+
+- When printing a function definition, 'typeset -f function_name' now
+  regenerates and reformats the code instead of dumping it from a fixed
+  offset in the original source file. The output is no longer corrupted
+  when the source file changes after the function was defined.
+
+- A new 'alarm' built-in command allows executing any commands at regular
+  intervals. TODO: https://github.com/ksh93/ksh/issues/422
+
 New features in shell options:
 
+- A new --arrowkeysearch option, on by default, causes the up and down arrow
+  keys to act like PgDp and PgDown -- see 'New command line editor features'
+  above. When turned off, the up arrow key now does not perform any search
+  (note that, in the old behaviour, the down arrow key never searched).
+
 - A new --globex shell option allows pathname expansion of extended patterns
   (those with a syntax involving parentheses) from fields resulting from
   field splitting (e.g., unquoted variables as command arguments). This
   remains disabled by default for compatibility with POSIX and ksh88.
 
 New features in shell variables:
 
-- SRANDOM is a secure random number generator. It uses the OS implementation
-  of arc4random(3) or, absent that, an integrated OpenBSD-based version that
-  uses the ChaCha20 cipher. An upper bound can be set by assigning its value
-  to SRANDOM; subsequent numbers will be uniformly distributed between 0 and
-  the value of the upper bound minus one, in a way that avoids "modulo bias".
+- Added SRANDOM, a secure random number generator. It uses the operating
+  system's arc4random(3) library function or, absent that, an integrated
+  OpenBSD-based implementation that uses the ChaCha20 cipher. An upper bound
+  can be set by assigning its value to SRANDOM; subsequent numbers will be
+  uniformly distributed between 0 and the value of the upper bound minus
+  one, in a way that avoids "modulo bias".
+
+- TIMEFORMAT supports a new %C format directive that yields the total number
+  of CPU seconds, i.e. the sum of the time spent in user and system mode.
+
+- TIMEFORMAT now supports a precision of up to six places after the decimal
+  point. The default precision for format directives remains 3.