SoMobile has it that Vodafone will sell the white S II for the same price it's offering the black version. Thus, customers will be able to get it for free on plans starting at £36 per month.
Just like the darker edition of the new Galaxy, the white one features Android 2.3 Gingerbread, a 4.3 inch WVGA Super AMOLED Plus display, 1GB of RAM, dual-core 1.2GHz processor, 8MP rear camera with 1080p video recording, and 2MP front-facing camera.
source: Unwired View
