Yes, this is technically a Jhin buff.
With their rise in popularity (ever since Stealth Wards sold out), the prevalence of Vision Wards has highlighted how cumbersome it is to clear them out. In keeping with the themes of Midseason, we’re easing the burden of cutting down successive pinks while making them more valuable to defend. Vision Wards have always been a mini-objective, so now we’re formalizing it.
BASE HEALTH :  ⇒ 4
REWARDING Now regenerates 1 health every 3 seconds after 5 seconds out of combat.
When vision is in an easily acquired consumable state, a few things tend to happen. For starters, vision becomes an arms race due to the inherent power of map knowledge - making the appropriate answer to 'how many wards should we have' universally 'as many as you can, always'. This means that, executed optimally, an entire team's excess gold income (or primary income, if you're a Jungler or a Support) is funneled into keeping up as much vision as possible at all times.
This means decisionmaking around the questions 'when is the right time to ward?' and 'where is the right place to ward?' is thrown out in favor of sheer throughput. By removing 'safe' vision from the map (invisible wards) and placing the other vision resources on meaningful cooldowns, teams will have to think a lot more about where they light up the map, rather than ward coverage being a function of team gold advantage.
VISION WARD COST : [100 gold] ⇒ 75 gold
WARDED OFF Stealth wards are no longer available for purchase
STEALTH WARD DURATION : [180 seconds] ⇒ 150 seconds
PICKING UP THE PIECES Upon death or expiration, wards leave behind Rubble. Rubble is team colored, lasts up to 5 minutes, and appears as circles where the ward was when it was active.
INSIGHTFUL Wards now indicate their vision range while being placed