Update Windows Phone 7.8 rolled out and you can update all the phones with mango

Microsoft began to update phones from 7.5 to 7.8. Updates come via Zune. If they don’t come, you can try a small hack (updated LG Optimus 7 itself):
wp7forum.ru :

If you don’t want to wait, you can try the classic scheme: phone to airplane mode, launch an update search in Zune and at that moment disconnect the Internet connection; There is a chance that once in a while you will receive a message that there is an update. But this path is unofficial, dark ...

From the new:

• Bing wallpaper on lockscreen
• 20 accents
• Work without a physical camera button
• New types of tiles
• Bugfixes

... Actually everything. It's a pity. There was no extended support for additional languages ​​that are in WP8. It seems that you can not change the Lockscreen in their programs. And the API functions not related to the new hardware stuffed WP8 phones appeared. Yummies only on WP8 =) Although it’s good that the old users haven’t forgotten at all and this is not even the latest update for the WP7 line.

On this topic:
wpcentral
wp7forum