One new feature that will be available in iOS 8.1 is: Text Message Forwarding.

Any text messages sent to a phone number on an iPhone will be forwarded to other iOS devices using the same Apple ID. To enable this feature once you update is by simply going to: Settings > Messages
Enable Test Message Forwarding for
other iOS devices. They have to be
logged in to iCloud using the same Apple ID with the iPhone.

Read here for the release time of IOS8.1 in your time zone