Arriving alongside PS4 update 2.0 will be a system software update for the PS Vita and PS TV systems.
Detailed today, update version 3.35 will add four-player Remote Play support to PS TV. Additionally, the Live from PlayStation app, which allows users to watch live gameplay streams from PS4 systems, will be available on both the Vita and PS TV alongside this update.
Sony also announced that the PlayStation App for smartphones and tablets is also set to receive an update to version 2.0. This will come "within the same launch window" as both the PS4 and Vita software updates, and will provide a new layout for tablets. The app's home screen has also been redesigned.
Unfortunately, we don't know when any of these updates will occur has Sony has yet to confirm the release date for them.
[PS Blog]