The Vita has been confirmed for a Feb 22, 2012 release for the US and Europe! Same day release for US, Canada, Latin America, and Europe.
Prices stand at: (RRP) [£229.99 / AUD$349.95 / NZD$449.95], US$249.99 for the Wi-Fi model and €299.99 (RRP) [£279.99 / AUD$449.95 / NZD$549.95], US$299.99 for the 3G/Wi-Fi model, excluding contract. Thanks void3!
Playstation Blog Post