For the parks I track still waiting on...
Animal Kingdom
Disney's California Adventure
Knotts Berry Farm
Holiday World
Kentucky Kingdom
HW and KK usually announce late.
Six Flags announced all their parks like they usually do. For Cedar Fair, we're still waiting on a few.
Let's look at SF V. CF for 2019 and the last major coaster (not carnival or kiddie).
Six Flags
SFMM - West Coast Racers (Premier Quad Launch) (2015 - Twisted Colossus)
SFNJ - Wonder Woman Lasso of Truth (Giant Zamperla Discovery) (2006 - El Toro)
SFGAm - Maxx Force (S&S Air Launch) (2014 - Goliath)
SFoT - Lone Star Revolution (Larson Looper) 2011 - New Texas Giant)
SFoG - Pandemonium (Giant Zamperla Discovery) (2018 - Twisted Cyclone)
SFNE - DC Cyborg (Chance Freestyle Flat Ride) (2015 - Wicked Cyclone)
SFFT - The Joker Wild Card (Giant Zamperla Discovery) (2018 - WWGLC)
SFDK - Batman The Ride (S&S Free Spin) (2016 - The Joker)
SFDL - Sky Screamer (Star Flyer) (1999 - Ride Of Steel)
SFA - Firebird (B&M Floorless Conversion) (2000 - S:ROS)
SFSTL - Supergirl (Zamperla Endeavour) (2008 - American Thunder)
*SFGE - Bucket Blasters (Water Ride) (1994 - Comet)
Cedar Fair
Cedar Point - Forbidden Frontier on Adventure Island (???) (2018 - Steel Vengeance)
Carowinds - Copperhead Strike (Mack Dual Launched) (2015 - Fury325)
Kings Island - Antique Cars (2017 - Mystic Timbers)
Kings Dominion - (2018 - Twisted Timbers)
Dorney Park - (2005 - Hydra The Revenge)
California's Great America - (2018 - Railblazer)
Knotts Berry Farm - (2018 - Hangtime)
Worlds of Fun - Boathouse Grill (WoF announced a Restaurant) (2009 - Prowler)
Valley Fair - (2007 - Renegade)
Michigan's Adventure - A Park Bench (1998 - Shivering Timbers)