So in this thread we share whatever proof (fansites are not applicable without a source leading to someone from Mojang directly stating) of features in future versions (not only 1.8)
I'll start out.
1.8:
(new) Cave Spiders http://twitter.com/#!/jeb_/status/110991839804399616
(new) Herobrine(?) not sure if troll http://twitter.com/#!/Kappische/status/1...4692301824
(new) Swamps http://twitter.com/#!/jeb_/status/110054366676922368
(new) Vines http://twitter.com/#!/jeb_/status/109613391219392512
(new) Pig snouts http://twitter.com/#!/notch/status/109628703788646400
(new) Cats http://twitter.com/#!/Azumikkel/status/1...3731579905
(new) Server list http://i.imgur.com/xKCrT.png <3
I'll start out.
1.8:
(new) Cave Spiders http://twitter.com/#!/jeb_/status/110991839804399616
(new) Herobrine(?) not sure if troll http://twitter.com/#!/Kappische/status/1...4692301824
(new) Swamps http://twitter.com/#!/jeb_/status/110054366676922368
(new) Vines http://twitter.com/#!/jeb_/status/109613391219392512
(new) Pig snouts http://twitter.com/#!/notch/status/109628703788646400
(new) Cats http://twitter.com/#!/Azumikkel/status/1...3731579905
(new) Server list http://i.imgur.com/xKCrT.png <3