[ストロボ・EdGE]

According to Oricon, the following artists are anticipated/expected to perform at this year's Kouhaku:

The Red Team
AI
aiko
Amuro Namie
Ayaka
Angela Aki
Ikimonogakari
AKB48
Every Little Thing
Ootsuka Ai
GIRL NEXT DOOR
Katou Miliyah
Kimura Kaela
Kuraki Mai
Koda Kumi
Shiina Ringo
JUJU （JUJU with JAY'ED）
Superfly
Takahashi Mariko
Nakashima Mika
Nakamori Akina
Perfume
Hamasaki Ayumi
Hitoto Yo
MINMI
Morning Musume.

The White Team
Aqua Timez
Arashi
w-inds.
EXILE
KREVA
Gospellers
Kobukuro
Saitou Kazuyoshi
SEAMO
SID
Sukima Switch
SMAP
Tsuruno Takeshi
Touhoushinki
TOKIO
Tokunaga Hideaki
AAA
BEGIN
Higuchi Ryouichi
Hirai Ken
FUNKY MONKEY BABYS
Fukuyama Masaharu
Fuse Akira
Pornograffiti
Yuusuke

Source:
http://www.oricon.co.jp/music/specia...01.html#close1

Sorry if I misled! It turns out these are not the official guests but more who is anticipated.