Hangouts cross-device sms sync?

Does anyone know exactly how hangouts sms integration will work across devices?

So Hangouts will be the main sms app on the Nexus 5.

If no one i text has hangouts and i purply use hangouts as a sms app will i be able to see them sms conversations on my computer or tablet.

So say i send a text via hangouts on my phone, will i be abe to pick my tablet up (Nexus 7 2012 wifi), read that sms convo and reply from my tablet as an sms text? Same with the hangouts computer client.