"(A)pps now can share XAML between WinRT and WP8 (sometimes whole pages)," wpthrowaway said.
Microsoft isn't expected to provide a common app store for Windows Phone and Windows Store apps until 2015, according to what I've heard from my contacts. But greater code use is a key step toward enabling this.
IE 11 browser update with WebGL support (plus ability to play YouTube videos on the page)
Facebook account integration removed from Contacts hub
Single sign-on persists across apps
Updated camera layout
Microsoft officials, predictably, are not commenting as to whether any of these leaked features are real.
"We regularly involve our developer community in a variety of private programs. We have nothing to share broadly about our recent developer outreach," a spokesperson said via a statement.
Microsoft took a lot of heat for holding off on providing its phone developers with early access to the Windows Phone 8 software development kit. This year, it seems the Softies decided to take the risk, even though the possibility of leaks would -- and seemingly did -- rise exponentially.
From what looks like official developer documentation, shared by RomanL: "Users can no longer broadcast share to multiple networks. Users of Twitter, Facebook, Sina Weibo and LinkedIn must use apps for these social networks to compose, post, and update. Facebook Blue is built into Windows Phone (code-named "Blue").
Developers also will still be able to "create a Silverlight-based Windows Phone (code-named “Blue”) app using C# or Visual Basic, or ... upgrade an existing Windows Phone 8.0 app to Windows Phone (code-named “Blue”)," according to additional information RomanL shared. In this case, Silverlight 8.1 refers to a new app model (not a new version of Silverlight) that will allow developers to enable their older apps to take advantage of some of the new Windows Phone 8.1 features, I hear.