Troy,
The main reason to switch from the EFIS-D180 to the SkyView is the improved situational awareness afforded by Synthetic Vision and the terrain Moving Map. There are also many user-interface and user-configuration improvements with SkyView, and the built-in redundancy in the SkyView System and Network make SkyView an industry-leading product. And SkyView incorporates newer hardware technologies that will allow us to add advanced features for years to come. That being said, there is nothing wrong with your current panel and we will continue selling the EFIS-D180.
If you do decide to upgrade, the components of the EFIS-D180 that are compatible with SkyView are the engine sensor kits, pitot tubes, and autopilot servos, so in many ways the upgrade will be easy. The rest of the components, such as Remote Compass, cannot be used with SkyView. The SkyView 7" display is slightly larger than the EFIS-D180, so the hole in your panel will have to be enlarged. You will have to rewire the primary harness, and run SkyView Network Cables between modules. You will need a SkyView Engine Module which can mount somewhere up near the firewall, on the "cool side". And a new SkyView ADAHRS module which contains the Remote Compass and Air Data System, so your pitot, static, and angle of attack pneumatic lines will have to be routed to it. Our Beta testers have been able to make the switch pretty easily.
For SkyView, for now, your Garmin 430 will act more like a handheld GPS. Which means you can connect via a serial line and obtain GPS position, velocity data, and basic waypoint information. You will not be able to utilize the more advanced GPS features of the G430 via SkyView, such as auto scaling of the CDI needle, vertical guidance, GPS steering (the ability for an autopilot to "cut corners", and not just fly to a waypoint and then turn), or virtual VORs. You will also not be able to use any of the NAV radio features of the 430, such as a VOR, ILS, or glideslope. All of this data comes over ARINC-429.
It is correct that SkyView has HSI control knobs and annunciators already "built-in", and the existing HS34 Module will not work with SkyView. Along with control knobs and annuciators, the other purpose of the HS34 is to provide an ARINC-429 conversion. SkyView will not have the ARINC-429 capability initially, and will require an interface module to be added later. This new SkyView ARINC-429 module will hide behind the panel. ARINC-429 supports the advanced GPS features as well as the only possible connection to the 430 NAV radio. So as you mentioned, in order to fully utilize your Garmin 430 with SkyView you will have to wait for the new SkyView ARINC-429 module.
I hope that helps! I'm afraid I could not answer without getting into some technical details.
-Robert
Dynon Marketing