The reason Mathieulh recommends to get a PS4 Pro now is because new PS4 Pro models on the market today are pretty much guaranteed to ship with firmware 3.70. Firmware 3.70 in itself probably doesn’t have anything special except that 1) it is below 4.06 and 2) you always want to stay on the lowest firmware possible if your goal is to jailbreak. As a reminder, new PS4 Slims today ship with firmware 3.55 and should be good as well. My personal plan, which I executed around black Friday, was to buy a PS4 Slim (and update it to the latest firmware for gaming purposes), and keep my original PS4 on firmware 4.01.
PS4 Pro 4.05 and below have been rumored to be jailbreakable
PS4 4.05 Jailbreak – When do we get a release?
No hacker has announced any release for a PS4 4.05 jailbreak. All we know at this point is that several trusted hackers from the PS3/PS4 scene seem to have access to this jailbreak.
Mathieulh in particular, despite his deep involvement with the PS3 scene, has rarely seen his name associated to any release in the past. I have discussed with Mathieu a few times in person, and unless he has changed his point of view recently, he is one of the hackers who believe in the “with great hacking powers comes great responsibility not to release your work” motto: hackers can have fun but should not share their findings as people will always use that for copyright infringement, which is ultimately the responsibility of the hacker. I personally disagree with this point of view, but Mathieu gets the credit of being consistent on that topic since the PSP days. I’d be more in agreement with something along the lines of: “If you don’t plan on sharing it, don’t even talk about it”.
As always, if you have any interest in homebrews or running unsigned code on your PS4, it’s better to have a plan: Either get a second PS4 that you’ll keep on a low firmware, or ensure your main PS4 stays on a low firmware (which, nowadays, means pretty much unplugging the console from your network)