Regarding the discussions about the lasting integrity of SDC's character, we have this discussion multiple times in every new project thread and the inevitable conclusion is this: the park is going to keep changing, no matter what. We can certainly voice our opinions and help the PMB keep the park enjoyable to as many people as possible, but there's a thin line between constructive criticism and whining that sometimes gives enthusiasts a bad rep, especially SDC enthusiasts.
I always worry that the park will someday be little more than a well-themed Six Flags, but every year the park impresses me with well thought-out additions and attention paid to the details. Surely a lot of this comes from their listening to and understanding what their guests want. I think they've been able to maintain a lot of their character over the past decade while substantially re-orienting their product, and we should all be thankful for that. Like others have mentioned, it's a different market and customer base out there today, and SDC still has some catching up to do in some areas such as major rides.
But back to the actual project discussions, the third-hand accounts I've listened to seemed to be pretty positive that Pete was implying that another coaster was coming, but of course these third-hand accounts after all and who really knows what Pete was trying to imply. The only thing we really know for sure is that there's something to look forward to again already.
If not a coaster of some sort, my immediate bet would be on a frisbee-style ride from Zamperla. SDC seemed to be looking into the concept for their 2007 project but chose TGS instead. At that time they were still doing business with HUSS, who invented the frissbee style ride and was once the go-to company for large, top-of-the-line flat rides. Zamperla has been a major supplier of theirs this decade, and they make a pretty good frissbee style ride themselves now.
The drop tower concept has popped up at least twice though, so that's something they've been obviously considering for a long time...