Hi Gautier,
First, I should note that you can build your own elevation chart using
some charting tools (such as google visualization gadgets or flot or
whatever your preference is) and the elevations in the KML.
In addition, as noted by others in this thread, if you do not have the
elevations in your KML you could use the Elevation API, or even query
for the elevation in the Earth API (more accurate if you have zoomed
into the area of interest -- see
http://code.google.com/apis/ajax/playground/?exp=earth#retrieving_ground_altitude_data
) and use this data to build a chart yourself.
However I believe your question was more related to whether you can
get programmatic access to display the same type of charts (elevation
and associated telemetry data, for example) that you can now enable
with the UI in the new GE 5.2 client. This question is what I was
answering above (not currently possible).
As for the roadmap, we generally don't discuss specific plans, but as
a general rule we do intend to continue adding new features to the API
so developers can not only mimic behavior of the client UI, but even
do much more. One of the things we take into consideration when
deciding which features are most useful to developers is the
popularity of any given item in the issue tracker, so please feel free
to add this as a feature request.
Cheers,
-Josh