Yes..you can absolutely still forward the TCP and UDP ports on your router. The process is exactly the same as on the PS3 since you are actually configuring the router and not the console. You can use the port forwarding guide for PS3 BF3 on portforward.com if you want...just use the ports I'm listing below instead of the ones portforward.com has for Bf3 (most are the same anyway).
What ports should be forwarded for the PS4 console? [manuals.playstation.net]
When using PSN at an office or other location with a shared network, a firewall or other security measures might prevent you from connecting to PSNSM. If this occurs, refer to the following information.
With PSN, you connect with a PSNSM server using the Internet, or connect directly with other PS4™ systems. The following port numbers are used to connect with the PSN servers using the Internet.
TCP: 80, 443, 1935, 3478, 3479, 3480
UDP: 3478, 3479
When competing with other players in an online game, you connect directly with other PS4™ systems. A different port number is used each time you connect.
Communication might be restricted depending on the security functions provided by your router or Internet service provider. Refer to the instructions supplied with the network device in use, and information from your Internet service provider.
Hope that helps ya man.