Originally Posted by
hotphil Windows Insider will get access to Windows 10 for Phone previews as/when Microsoft releases it to certain handsets. It's still a preview. It's expected to be buggy. No one knows the schedule. Only Microsoft know if/when other handsets may get it. No one else.
Spideymaniac's right, Preview for Developers is another app for more "polished" builds. Again, only Microsoft knows if/when builds will get released. No one else knows. And Microsoft aren't telling.
Microsoft have previously said any handset running Windows Phone 8 will be eligible to get to Windows 10 for Phone when it is released. No one knows when that will be. Or even if they'll stick to that promise.
Agreed, just have to be patient. Although I must admit that I'm quite anxious to start testing and providing feedback to MSFT. Not sure I want to pick up a boring Lumia 635 for that purpose though.