Nice, but who knows...
I have the feeling that progress is going to move at a snails pace.
If anything... it'd be nice if there's an overhaul in the graphics department, too...
...the engine is about 3yrs old, at least... and it's not getting any younger, and I have a feeling that v. 1.4 won't be out until around April of next year.
I'd like to see how he'd do Suspended coasters... it'd take a lot of physics to get that right... not just gravity, but how the coasters would swing properly, of which would be a real job.
I think the best option is to go for the shuttle coasters, give a small face-lift to the graphics & give the sound effects a little more realism for each specific coaster type!
That's good enough for a update...
THEN... come out with a 2.0 which would be a pay-per-update. (2005 est).