Starting on some User Guide additions and edits. This is work in progress!

doc/user_guide/en/new_features.adoc

@@ -1,29 +1,31 @@
 [[NEW_FEATURES]]
 === New in Version {VERSION_MAJOR}.{VERSION_MINOR}
 
-_WSJT-X 2.5_ introduces an enhanced Q65 decoder that measures and
-compensates for linear frequency drifts of Q65 signals.  Activate this
-feature by setting a spinner control *Max Drift* on the _WSJT-X_ main
-window to a number greater than 0.  We suggest a setting of 10 for
-submode Q65-60A, the recommended submode for EME on 50 and 144 MHz,
-which will accommodate drift rates up to 20 Hz/minute.  Similarly, we
-suggest *Max Drift* = 40 for submode Q65-15C, used for for 10 GHz QSOs
-(up to 900 km) via aircraft scatter and drift rates up to about 20
-Hz/s. When *Max Drift* = 50 the decoder will use an enhanced algorithm
-to compensate for larger aircraft scatter drift rates, successful
-decodes with this algorithm are tagged with a `q5` indicator.
+_WSJT-X 2.6_ implements features in support of the ARRL International
+Digital Contest.  This contest's scoring is distance based, so the
+*Call 1st* checkbox is replaced by a drop-down control offering *CQ
+Max Dist* as an alternative.  A new window labeled *Active Stations*
+displays a list of received but unworked callsigns sorted in
+decreasing order of potential contest points.  See Section 7.4 for
+more details on these features.
+
+Decoding performance for FT8 and Q65 has been improved for situations
+where _a priori_ (AP) information is available.
+
+*Echo* mode now offers a button labeled *Clear Avg* and produces
+reliable measurements of SNR and Doppler spread.  The related
+*Measure* function can be used to measure these quantities for a
+received unmodulated carrier -- for example, a key-down test signal
+emitted by another station and reflected from the Moon.
+
+New buttons on the main window allow quick changes between the modes
+FT4, FT8, MSK144, Q65, and JT65.  Another button allows toggling the
+FT8 Hound mode ON or OFF.
+
+Optional highlighting is provided for DX Call and DX Grid, and for
+messages containing RR73 or 73.
+
+New options are provided for writing to file ALL.TXT.  You can request
+starting a suitably labeled new file every month or every year, and you
+can disable writing altogether.
 
-On the Windows platform only, _WSJT-X 2.5_ installations now include
-an early version of _MAP65 3.0_.  This program works together with
-suitable hardware that converts RF to baseband.  The hardware/software
-combination implements a wideband, highly optimized receiver for the
-Q65 and JT65 protocols, with matching transmitting features that
-require a standard SSB transceiver.  _MAP65_ is effective in both
-single-polarization and dual-polarization systems.  If two
-polarization channels are available, _MAP65_ determines and matches
-the linear polarization angle of each decodable signal.  This
-capability provides a major advantage for efficient EME communication
-on bands up to 432 MHz.  A single-channel _MAP65_ system works
-extremely well for EME on 1296 MHz and higher bands, displaying all
-signals in a 90 kHz sub-band and decoding all the Q65 and JT65
-signals.