Apple has taken initiation to update its Apple Store app for iOS, with v1.1 and this is currently available with iTunes. The new update brought special news about white iPhone 4 and indicated its release. The update app has the white iPhone 4 reservation option in it. Currently it is indicated 16GB and 32 GB models availability for this reservation along with regular black iPhone 4.
In fact, the option is available specifically for white iPhone 4, but this is not yet active unfortunately. It is prompting a message as “Because of high demand, we are not currently taking iPhone reservations”.
In fact, there was an announcement of White iPhone 4 along with the black iPhone, but delayed very badly and Apple responded for this with a blame over the manufacturing issues.