Yeah i think that wallpaper was fanart too..didnt really look like something sasuke or sakura would wear:]
and gai rules
he has worldclass humor and we havent seened his true powers yet,i suspect he might make rock lee look like a sissy:]
its kindy funny how it all goes: Jiriyia was taught by sarutobi (the third) and then Jiriyia taught the forth then the forth taught kakashi and then kakashi taught naruto and now Jiriyia teaches naruto
and yeah i suspect the forth is either Narutos big brother or his father its alot of simularities there and the fact that we doesnt hear his name makes me suspect even more that his name is "uzumaki" or something..we will without a doubt find out later on.