Confirmed? Saw Shahid praising it on twitter some time ago, so I was just waiting for a Vita port announcement.
Edit: Cave listed as a xbone dev in jp.
Why not Playstation too, Cave? Why?
Info based on this guy
http://thevitalounge.net/monument-valley-possibly-coming-to-vita/
Recommendations for 50PPP Vitagaffers:
A Fighting game? Street fighter x Tekken, Marvel Vs Capcom 3 Ultimate, Mortal Kombat ,Injustice, DOA 5 plus.Bloody Roar 2(PSOne), Street Fighter Alpha (PSP)
A Racing game? NFSMW, WRC3,Wipeout 2048, Ridge Racer(PSP game), R4(PsOne) , Gran Turismo Portable( PSP), Burnout Legends(PSP)
A Puzzle game? Yu nama : The Puzzle(PSM), Crush(PSP game), rymdkapsel(more a strategic game)
A RPG? Persona 4 Golden, Demon Gaze, Tactics Ogre: Lets Cling us together(PSP game), Vagrant Story(PSxOne its only 90mb!), Final fantasy X HD collection (best Vita port?)
An indie game? Flower, Guacamelee!, Tales from space , Steam World Dig, Hotline Miami.TxK
A car battle game? Twisted Metal Head On, Cel Damage, Twisted Metal 2(PSone)
An Horror game? Osbcure the aftermath(PSP), Resident Evil 1, 2 and 3(PsOne), Dino Crisis(PsOne), Silent Hill(PsOne), Silent Hill Origins(PSP), Silent Hill SM(PSP)
A 3d platform game? Sly 4, Jak n Daxter collection(if you never played them and dont mind lots of frame drops)
A Hack n Slash game? GoW: CoO, GoW:GoS. Ninja Gaiden Sigma +(the port is ok 30fps solid , looks nice on Vita)
A Monster Hunter clone? Soul Sacrifice (Try the demo is like 4 hours long), Toukiden.