I haven't looked into RCT4 at all, and I didn't even know it had been announced until I saw this topic.
That said, I'm really not surprised at this "mobile first, PC second" release they seem to be doing for the game. I've always seen RCT as a casual game, and as of right now, mobile is the biggest source of casual games out there. That doesn't mean it'll be good on mobile, and microtransactions won't be fun, but I think it makes sense from a business standpoint.
As for the No Limits style coaster building, I would be extremely surprised if they implement it. RCT is, like I mentioned before, a causal game, designed to let anyone build their own theme park and rides. The system they have for building, while it has massive limitations, is easy to learn and use. No Limits has a much more in-depth and complex building system, and I think it would be much more intimidating to the casual crowd I see RCT marketing to. It's much more difficult to learn, and I think that would put a lot of people off the game.