Samsung Canada has announced that upcoming Android 4.1.2 upgrade for Samsung Galaxy Note 2 will bring Multi Window Support. The upgrade will be available through FOTA in the next week. Exact availability will vary by carrier.
Last year Samsung introduced this feature to Galaxy Note 2 owners on T-Mobile and some other networks.
Multi view is already available for rooted devices, and with that would come the ability to use multi-view with any app you download.