Ps4 – Changing the PS4 region

There is no way to do it (at least for now). You are required to be online to view trophies. Quote:

The PlayStation 4 will not allow users to look at their Trophies or Friends lists when the console is offline, Polygon has learned using a retail unit received for review purposes.

The PS4 still doesn't sync Trophies in the background — every time you load up your list of virtual accomplishments, the console takes a moment to sync with Sony's servers. Perhaps because of that, you can't view your Trophies list if you're not connected to the internet. On PS3, you can scroll through your Trophies whenever you want, and you can sync them the next time you're online. You can definitely earn Trophies while playing PS4 games offline, but if you try to look at your list when you've disabled the console's internet connection, you'll get the following error message: "[Connect to the Internet] is turned off. (NW-31484-0)"

Generally, PS4 games will be region-free with 2 major points:

• DLC must match the region of the game you are playing.
• Software makers still retain the right to region-lock their games.

Now this is the same as it was with the PS3. Which according to wikipedia only had 1 region-locked game: Persona 4 Arena. It is therefore likely that no game makers would region-lock their game.

At this current time, I cannot find any region-locked PS4 games.

Playstation 4 games generally being region free has been confirmed in the "Ultimate PS4 FAQ" on the official Playstation blog for Europe and North America:

"In general, neither digital nor disc-based games will be region locked, but PlayStation recommends that all users purchase games at the region of their residence to guarantee the best overall experience and customer service. In certain instances, a software publisher may choose to region lock a game title for specific reasons, but Sony Computer Entertainment expects these instances to be uncommon."