Through the BlackBerry Support Forums, BlackBerry's Ty Williams has confirmed that 2-way synchronisation will be available in an upcoming BlackBerry Link update over the coming weeks:
Thanks for your patience, in a few weeks we will be releasing an update to BlackBerry Link that supports two-way synchronization.
Is this the feature that you've been waiting for from BlackBerry Link or have you moved on to other services? Tell us in the comments.
Source: BlackBerry Support Forums