If it was like the "real" RCT games(1 & 2), yes I would be. Instead it's like the millions of free garbage iPhone/iPod Touch apps. So no, I am not excited, I am very disappointed as I LOVED RCT 1 & 2.
I remember hearing about it back in March, and while I was initially intrigued since I loved RCT 1 back in the day but I'm on the fence here. RCT 1 & 2 were great although I couldn't get into 3 (although playing it with a laptop didn't help matters). I might try it down the line if reviews are mostly favorable, but I remember the last console version bombed terribly so I'd fear some for control issues.
N-Space is making the game instead of Chris Sawyer / Frontier, so expectations are incredibly low. They have made some good DS games in the past like the Call of Duty series, etc, so it may not be bad....