Saying this is a game changer is an overstatement and PR bait as VRR is already possible on current HDMI standards. PS4 Pro already has support for VRR as well as the only thing that is missing to enable it a TV that supports it.
Umm... no. Any device with the hardware to support this feature actually contains hardware within it that is above current HDMI standards. HDMI 2.0 (the current latest standard) does not support this, and it's not possible on it. There will be and are devices on the market that have HDMI 2.0 that will not be able to implement this feature via firmware upgrade due to them just meeting current standards rather than packing in hardware that perform much better than what the current standards require.
At this point in time, we have no idea whether the hardware components included in the PS4 Pro are the type that are eligible to enable this feature via firmware upgrade or not. There has been no indication it can as of yet, so yeah, like the others said. Receipts.
I don't suppose that Tv's will ever get freesync? Glad I held off buying the Sony
TVs will be getting it. When is the question. Some TVs that released in 2016 will be able to support this via firmware upgrade. But yeah, we have no idea which ones. It'll likely be a common feature in TVs in 2019 or so.
I bought a relatively cheaper but still decent quality TV with the intention of getting a much better one a few years down the line. I was really glad that I didn't end up going for an OLED that was 3 times as expensive after news of this feature coming to TVs soon came out. This current TV will fare just fine for the next few years. I'm expecting to buy a new one (that will have this feature at a decent size) probably around the time a PS5 Pro is coming out.