With Magic Mountain and Great America teasing huge additions for 2019, I'd assume that our chances of something even remotely close to a T-Rex are incredibly slim.
I've heard rumors from several Discord Servers that Six Flags had cancelled all future Skywarps, however no evidence was shown to back it up, so take this with a grain of salt. The supposed reason for it was because of how much of an atrocity Harley Quinn at SFDK has become. If anyone has any more information regarding this, please feel free to share it, as it'll help make future predictions A LOT easier. If this ends up being false and we do get a Skywarp, as much as I don't want to see one, I would predict it going in the same area as Cyborg and Justice League, it would complete the area for the time being.
Something I would much rather see than a Skywarp that doesn't include coasters would be a Zamperla Giant Discovery. We need one of these badly, and I would rather have it installed before a coaster even. We have a pretty decent thrill ride lineup thanks to the past decade, and something like it would help top it all off in a very well rounded way, unlike a Skywarp. Seeing a record breaking one would be even better, and it's totally possible for it to happen as we stole the drop ride world record from Magic Mountain immediately after Lex Luther's debut just a few years ago.
As for where it could go, I could see anything in this region pictured here as fair game, it'd be really cool to see it compliment Ka and Zumanjaro the same way El Diablo compliments El Toro. If it does end up being a record breaker, then The Golden Kingdom will be one of the only park sections in the world with exclusively record breaking rides.
Besides that, I don't really have an opinion on anything else. I think that we should be blacklisted from any kind of Skywarp since we already have it's "1/2'd" counterpart (El Diablo), we should get a Giant Discovery instead, and have our major coaster addition become a reality in 2020. I'm predicting it to be something huge and record breaking, even beyond a Raptor or T-Rex. Only time will tell at this point.