here is a list from beechtalk
Hello everyone,
I apologize if the notification didn't come across very clearly, I'll definatley check into it when we return to work on the 26th. as for the items that are being addressed in the 3.0 software, there are a number of minor issues that we're addressing that won't ever be seen by the installers of owners such as yourself however the main issues are:
Major features
• Weather radar:
o Garmin GWX 68
o Garmin GWX 70 (will not be approved under the STC yet due to the GWX 70 schedule)
• GSR 56:
o Position reporting
o Weather
o Phone
o SMS texting
• GDL 88:
o ADS-B Traffic
o Weather
• TCAD:
o TCAD 9900B (RS-232)
o TCAD 9900BX (RS-232)
• GNS Crossfill (note that this is covered by the GNS STC, not the GTN STC):
o Automatic crossfill of active flight plan from GTN to GNS
o Manual crossfill of user waypoints in both directions between GTN and GNS
Smaller features
• Pilot-configurable top data fields on GTN 7XX, right side data fields on GTN 6XX
• Ability to graphically edit direct-to legs
• Geo-referenced FliteCharts
• Ownship on the charts page
• Ability to sort airway exit points geographically
• Ability to turn GMA 35 ASR on and off
• Ability to turn GMA 35 3D audio on and off
• Smart Airspace
• Ability to turn European airway airspaces on and off
With version 3.00, the GTN will support the following new enablement cards:
• Digital radar enablement – Required to configure an ARINC 708 port to interface with a third-party weather radar. (this has been delayed as there was a minor problem and will be addressed in the first quarter of 2013)
• Ground clutter suppression enablement – Required to configure the GWX 70 to use its ground clutter suppression feature. As noted above, though, the STC will not approve the GWX 70 until later.
• Turbulence detection enablement – Required to configure the GWX 70 to use its turbulence detection feature. As noted above, though, the STC will not approve the GWX 70 until later.
The GSR 56 does not require any enablement cards.
It does require having your local Garmin dealer install this.
Let me know if there is any questions,