Bueno me disculpo, no suelo usar versiones tannuevas pero por esas cosas tuve que hacerlo y para mi sorpresa me encuentro con SerialPlotter.
La 1.6.5 no tenía la opción porque la use hasta hace poco y se que no.
Si vas a Previous Versions existe por ahi un comentario sobre los cambios y bugs corregidos.
Ahi puedes encontrar la respuesta exacta a tu pregunta.
Fixed font rendering not anti-aliased on Windows (regression)
Increased number of colors on serial plotter to 8, thanks @cousteaulecommandant
ARDUINO 1.6.13 - 2016.11.22
[ide]
Improved robustness of Serial Plotter while dealing with malformed or partial data. Thanks @xloem.[/pre]
Fixed regression on command line upload.
Bugifx installing libraries from command line: the IDE tries to update the libraries index but it
didn't use it straight away (this caused issues mainly on CI environments)
Libraries and Boards Managers: if a download error happens (CRC error) the IDE tries to download the file again
without the need to remove the corrupted file manually.
Improved serial plotter with horizontal axis and grid. Thanks @duff2013
Windows: Improved DPI detection
Fixed a bunch of small bugs in the editor.
ARDUINO 1.6.9 2016.05.10
[ide]
Catch and report errors during parsing contributed index files
Fixed IDE version color on about dialog box. Thanks @ivanebernal
The "always-on-top update notification" popup is now less intrusive.
Fixed untraslated string during IDE startup splash window. Thanks @ivanebernal
Serial plotter now allows to plot multiple values at once. Thanks @henningpohl
New translations
Added support to file:// protocol for boards manager URLs
Portable sketchbook folder can now be any arbitrary location
Fixed a bug that caused Boards Manager to install the same tool twice or more, thus wasting disk space, if other cores where using tools delivered by arduino
Fixed various Boards manager glitches, in particular when removing a board
Windows: Arduino IDE icon is now in high definition, bye bye that blurry icon
Remote upload without SSH is now supported (allows OTA upload for many 3rd party boards). Thanks @me-no-dev.
ARDUINO 1.6.6 - 2015.11.03
[ide]
Switched to Java 8, which is now both bundled and needed for compiling the IDE
Added link to unofficial boards support list in preferences
Limit of possible new sketches in a day raised to 676. Thanks @Chris--A
Windows: fixed a bug when running username had non ASCII chars
Lots of fixes
ArduinoISP examples moved under 11.ArduinoISP folder
MacOSX: binary is now able to tell the IDE its current working directory. Eases life to those using the IDE from the CLI
CLI: if specified board doesn't exist, fail instead of using a default one
Windows: IDE stores its stuff under %LOCALAPPDATA% instead of %APPDATA% (which was a roaming folder). %APPDATA% content is automatically migrated to new location
Added 74880 baud rate to serial monitor. Thanks @Chris--A
When changing tab, file name is shown in window title
IDE groups compiled files into "libraries", "core" and "sketch" folders
Added Serial Plotter. Thanks @henningpohl
Editor: triple click selects whole line
Windows: IDE startup feels faster
Examples of libraries with a .development flag file in their root folder won't get marked as read-only. See #2619
Update notifications: when updates are available from either Library or Boards Managers, a popup will be shown
Introducing arduino-builder, a command line tool that properly calls gcc. Fixes lots of issues about buggy preprocessing.
Each open sketch gets built in its own folder, allowing the IDE to recycle previous compilations and being much faster
"Go to line": CTRL+L or Edit > Go to line... will open a dialog where you can type the line number where you want the editor to jump to
Added boards.local.txt support: like platform.local.txt, allows to enrich a boards.txt definition without modifying the original file. Thanks @Wackerbarth
Library to library dependencies: when your sketch imports a library, and that library uses another, the IDE will find out without you having to add a useless #include to your sketch