As long as I understand the new NDA correctly, the subscribers can now talk about 3.0 freely. So in the spirit of that, I shall list some of the new features that I have found in 3.0.
-Current platforms are now faster
-New platforms also run very nicely
-The new Haxe language is wonderful. It is easy to use and also easy to convert AS3 code to
-Stencyl supports the mobile keyboard now so users on the mobile devices can now type
-Engine extensions are also available. You can now make an extension that adds functionality to Stencyl, whether it be new blocks or a new functionality. (I have made one that gets the Date and Time)
-Better Multitouch! There is now an event that controls multitouch which is much easier to use.
-New Events (iAds, Game Center, In-App Purchases, Attributes are equal to, Boolean is true/false)
-Dual Joysticks
-Local Publishing for all platforms! You can now publish to iOS directly from the Mac without using the Stencyl Servers
-Windows iOS testing (to an extent). You can now test iOS apps from Windows, although you cannot publish them and you need a newer generation device.
-Most of the Flash only blocks are cross-platform now!
-Better text support. You can now use the "When Drawing" block without hurting performance. You can also define a custom character set for a specific font, too (this supports characters with accents)
-Labels are now blocks! These are now blocks that are part of an extension which allow more advanced things verses the draw text block.
-Mac App Store publishing
-New Universal modes (there are three now)
-iPad Retina graphics support
-Blend modes for a specific actor or layer
-Log Viewer. View what is happening live in the Stencyl log for all platforms.
-Simple Physics engine. This excludes Box2D to boost performance yet still detects collisions.
-"Retina" graphics used for Desktop publishing
-Touch and Mouse blocks merged into just mouse which is much simpler
-Improvements to atlases (they now have no limit)
-If I think of more, I will add them here!!!
I hope this obnoxiously long list of new features answers a lot of questions about what is new in 3.0.
Stencyl 3.0 should release before the end of the year and there might be a blog post tomorrow giving more information than I already have.