Will Z10 be carrier locked or factory unlocked?

Noticd this was up for discussion, but buried in other threads.

Question is does anyone know (or in the know & can say) whether the Z10 will be sold by major carriers as factory unlocked or carrier-locked as per usual with the majority of their offerings...?

Nevermind branding, just wondering about the inter-network operability from the get-go without need to unlock...