The PS3 will not be able to play the PS4. They both are on the Playstation Network (PSN) and Playstation Plus will work for both of them as it does for the PS Vita and PS3
A person will not be able to hack the PS4 and then be able to play online for free. The games will need to be purchased as will the PlaystationPlus, which allows people to play online.
You don't have to pay for online gaming, unlike the PS4 - you don't need PS+ to be able to play it online.
connect your ps4 to your pc or monitor
It costs $49.99 in a year to play Sony's PS4 online.
no
Yes, one must have a PlayStation card to play the PS4 online.
To connect a PS4 to a cable box, use an HDMI cable. First, connect one end of the HDMI cable to the HDMI OUT port on the PS4 and the other end to an available HDMI IN port on the cable box. Then, connect another HDMI cable from the HDMI OUT port on the cable box to the HDMI IN port on your TV. Ensure the TV is set to the correct HDMI input to see the PS4 display.
You can connect a wi-fi adapter to a ps4 using Linksys PS4 Wireless-AC universal media connector.
No they have a different plug in to charge therefor the ps3 controller won't connect to the ps4
Yes of course
Not online
You can go to the PlayStation store and download the PS4 version on your PS4