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Remember this is just a pre-release and it's not the full version.
Found new features? What are you waiting for, add them here!
Wanna download 1.9 from the official links?
Here you go
Client http://assets.minecraft.net/1_9-pre5/minecraft.jar
Server http://assets.minecraft.net/1_9-pre5/minecraft_server.jar
-What to expect for PreRelease 6
*Square Moon/Sun
*Water physics fixed
*Explosion damage 'fixed'.
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Mobs
*Squids swim up. Passive squid animation is now vertical.
*Slimes no longer have a 'depth y0-16' restriction.
*Pigmen no longer accumulate fall damage while swimming in lava.
*Ender Dragons.
* Now take damages by player.
*Glows purple when killed, disintegrates and floats upwards - new animation effect.
*Drops loads of XP and one obsidian block.
*Have the same eye shining thin Enderman has.
*Dragon makes "a player gettin hit sound" when damaged.
*Mobs 'neutral' in creative mode. Except for spiders, ghasts, and silverfish.. Note: Enemies from spawners are still hostile.
*Dragon Eggs. - Not in game, recently tweeted by Notch.
*Baby animals in SMP.
Items
*Items retain their enchantments if chest is destroyed.
*Fences no longer connect to leaves.
*Lily pads are no longer gray in inventory, have a tool tip.
*Melons breaking into more than one piece again.
*Fixed fence "hitboxes".
*Balancing of enchantments.
*Find 'iron' gear in strongholds.
*Silk touch does not work on spawners.
*Game Crashing piston glitch fixed.
*Eye of Ender now points directly to the Ender Portal.
Controls
#Camera Rotation:-
* I, J, K, L, N, and M control where your looking (I,J,K,L are up down left & right, N and M are rotations)
*F9 Adds a fixed camera angle. ( You can move this with I, J, K, and L)
*M+N resets the view. *Important*
*H and Y are the zoom controls
*H + Y together resets the zoom
*F9 locks your view
*Tweet from Jeb_ (As you know I always forget at least one thing when upload a release... The "camera controls" (F6 etc) are not supposed to be there =/) So..don't get your hopes up. Though these features are really nice for everyone..except the flying in survival mode.
*Toggle fly with F6. Survival mode.
#You receive a warning when changing render distance to far only if you're not running Java x64.
#Option to turn off clouds in the video menu.
Textures/Liquid Movement Mechanics
#Texture Tweeks
*Gravel
*Glowstone
*Monster Spawners
*Iron Block
*Wood Planks
*Grass
*Water
#New Water Physics for vertical movement.
#Water is back the way it was before pre4, plus:
Whenever a water source is surrounded on all sides by blocks or water (not necessarily source blocks) and it has an air block or (non source) water block below, then that air/water block turns into a water source. From Darquan (I think it is intentional. It eliminates the underwater currents when you place and remove a block. The behaviour seems to be carefully chosen such that it cannot automatically flood entire caves, nor does it seem to break typical ways of using water for automatic harvesting.) Bug.
#Water can be placed in water again.
#"End Stone" (from The End) and "Mycelium" from the Mushroom biome!
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Lava can be made infinite by digging 1 square down, and making a "plus" sign - 5 squares total. Fill the outsides with lava.
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#(http://www.opticraft.net/proxy.php?request=http%3A%2F%2Fi39.tinypic.com%2Foshpif.gif&hash=f7fdea93ce915d869f537be80afbb607)
Misc.
#Lighting is different. Colors are now better matched with the color of the light source.
#Longer reach for fighting mobs.
#Creative mode - logging back in will no longer make you 'fall' from falling.
#Player bow draw-back animation improved.
#Range of attack distance in creative has Reports of better FPS.
#Balancing of enchantments.
#New Achievements
*DIAMONDS! - Acquire diamonds with your iron tools.
*Enchanter - Use a book, obsidian and diamonds to cunstruct an enchantment table.
*Librarian - Build some bookshelves to improve your enchantment table.
*Overkill - Deal eight hearts of damage in a single hit.
*We Need to Go Deeper - Going through a portal to the Nether.
*Return to Sender - Destroy a Ghast with a fireball.
*Into Fire - Relieve a Blaze of its rod.
*Local Brewery - Brew a potion.
*The End? - Locate the End.
*The End. - Defeat the Ender Dragon.
#Villages now have small fenced off patches of dirt with either wheat or tall grass growing in them, connected to the houses.
#Light glitch on stairs fixed.
#Jumping makes you lose xp points. Bug for some?
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Sources: MinecraftWiki and MinecraftForums and my Brain :P