Well, there is Super Mario bros x on supermariobrothers.org. You get to play as link for cyring out loud!
Super Mario Bros. Z
No there will be 15 episode of super Mario bros z
Yes there will be
The Sprite-Resourses
on newgrounds or youtube
yes
yes
Partially it is. Mario Brothers Z is a series for TV but they have not created a game for it. By seeing how old it is they probably will not.
youtube
now
probaly in the future
play it here http://www.yoyogames.com/games/60320-super-mario-bros-z-under-development