Download link to Minecraft 1.8 just got leaked:
Server
Client - Updated
Go to your appdata/roaming/.minecraft/bin and replace minecraft.jar with this one (client).
Delete any old versions.
Both of these links are hosted on minecraft.net domain, so it's not fake.
--- If picture's above doesn't work:
http://img12.imageshack.us/img12/9592/screen03g.jpg
http://img231.imageshack.us/img231/301/screen02k.jpg
http://img12.imageshack.us/img12/9489/screen01zu.jpg
---