According to a post from a Manager, in the official Nokia Discussion forums a new update will roll out very soon for both Lumia 920 and 820 focusing mostly on performance enchantments.
Hopefully they have included, at least, a fix for the random restarts / shutdowns that affects many-many-many Lumia devices. Lets hope for the best.
A Nokia Lumia Windows Phone 8 software update providing performance enhancements for the Nokia Lumia 820 and Nokia Lumia 920 has started rolling out over the air. Delivery will continue in a phased manner over the coming weeks and is expected to be complete by the end of February. You will receive a notification on your phone when the update is available for you to download.
Hopefully they have included, at least, a fix for the random restarts / shutdowns that affects many-many-many Lumia devices. Lets hope for the best.