Jim, I am Navionics' Product Manager for the Americas, Thanks for your interest. The info you have is correct, Droid is coming ... sit tight
Also, just wanted to point out the app now supports overlays with Google Imagery and Bing so it is as useful on land as it is in the water. That update is free to existing users and all apps going forward will support this.
Also, you mentioned a cartography difference between Platinum and the iPhone app. To be honest, there is no difference at all. The charts are the same information albeit in a different format. There is no change in quality. Begs the question, why is the app $15 when Platinum is $199? Because the app cannot do 3D, Pano Photos, Coast Pilots, and other features but the mapping is the same.
I should also point out, never versions of the app will allow you to report POI. In general, we have been adding new POI (shops, restaurants, marinas, launch ramps etc.) with every release (chips and Mobile) but only by our own efforts. Now you can add your own authorship to the map by reporting your own favorite places to visit which can only make all Navionics mapping more fun to use.
If you have any questions on any of our products, post up here and I'm sure it will find its way to me I'll do what I can to help.
Thanks, Shaun