source: http://open.dreamhack.se/news/244-first-batch-of-sc2-players-for-valencia.html
aAa DnS
APSC2 Velego
APSC2 Protosito
APSC2 Borrex
APSC2 Botvinnik
AT Gaming Jona
Axiom eSports Ryung
BoSs DaniA
Dead Pixels Majestic
Dead Pixels TRUE
Dead Pixels Elroye
Dead Pixels Patience
Dead Pixels FanTaSy
EnVyUS viOLet
ESOS Gaming PrinzZ
ESOS Gaming Gkamip
ESOS Gaming Insomnia
ESOS Gaming SmoNKa
ESOS Gaming Varrittor
ESOS Gaming Lutor
ESOS Gaming Hunter
ESOS Gaming Nugui
Evil Geniuses HuK
FTW esports Thomas
yoeFW San
GameOver e-Sports Jandro
GameOver e-Sports Kellermann
Imaginary Gaming Welmu
Imaginary Gaming Rotab
Imaginary Gaming TargA
Imaginary Gaming Deborah
Imaginary Gaming Soyhi
Imaginary Gaming Miniraser
Invasion-esport Harstem
Invasion-esport Curious
Jin air Green Wings Symbol
Jin air Green Wings Pigbaby
Jin air Green Wings Terminator
MiC Frikisama
MVP MarineKing
MVP GuMiho
mYinsanity Sacsri
mYinsanity Blysk
mYinsanity PengWin
mYinsanity Arium
mYinsanity Serral
mYinsanity Reynor
mYinsanity PtitDrogo
SupplyZero Teinez
Team Game Over ExCeN
Team Gravity WaKa
Team Liquid HerO
Team Liquid TaeJa
Team Liquid Bunny
Team Liquid MaNa
Team Liquid TLO
Team Liquid Ret
Team Menace ZhuGeLiang
TEAM PKT Inok
TEAM PKT NeXuS
TEAM ROCCAT HyuN
TeamGO MindTriiks
TeamGO IBIMarine
Tt eSPORTS White-Ra
Vination eSports Ziggy
Verdi
Mzrk
mUOz
thenanox
Kenro
Lysander
dom
Rubo
Jorpez
Anthen
hofobru
Ivacks
Seraphim
Exalon
UPDATE: more players are added, and the list is now complete : http://open.dreamhack.se/news/248-leenock-naniwa-lilbow-round-off-valencia-sc2-lineup.html
Rain cancelled his participation
aAa PsiOniC
aAa chubZ
aAa MiNiMaTh
aAa Balrog
AT Gaming FeaR
Millenium MarineLorD
Millenium Lilbow
Millenium Dayshi
Punchline Dext
Punchline Clem
Punchline jeysen
Punchline SouLeer
Team Property NaNiwa
Team Property Zanster
Team Property StarNaN
Team Property MorroW
yoeFW Leenock