1.9 is coming soon! Which means you need to know all about the new update. I found this really neat video that explains almost everything in a catchy and funny video. Here it is:
There is a lot in the update to process lol, its a huge update. Beware though for those who haven't read all the update features... potions will now require blaze dust to brew so blaze rods are going to be in much more demand. Also this song does not even cover half the total changes, just touches on the main ones. Full list of all current changes: http://minecraft.gamepedia.com/1.9