Windows Phone 7.8 update (and SDK update)

Windows Phone 7.8 update is officially started to come today, as it happened for my Nokia Lumia 800.
The main feature is the new homescreen with more room for resizable tiles.

Last week Microsoft released also the SDK update for Windows Phone 7.8. As written on official website, it adds the following to your existing Windows Phone SDK installation:

• New Windows Phone Emulator 7.8 
• New Windows Phone Emulator 7.8 256MB 
• Functionality delivered in the Windows Phone SDK 7.1.1 Update (for Windows Phone SDK 7.1 users)

Note: Windows Phone SDK 8.0 or Windows Phone SDK 7.1 must be installed before you can install Windows Phone SDK Update for Windows Phone 7.8.
You can download it here http://www.microsoft.com/en-us/download/details.aspx?id=36474