A preview video shows the login screen dedicated to the new champion Yasuo already available on the PBE and coming soon on our servers.
They were also popular images upload new skins for Christmas Snow Day Singed and Snowstorm Sivir.
These skins will be available during the Christmas season though has not yet been notified of the date of official publication.
The following videos and skins:

Snow Day Singed / Showstorm Sivir