The article implies that it is actually the FF Chronicles version. If so, meh.
If not, I hope it's just the original SNES version. Maybe with extras, but it's potentially some people's first introduction to the Chrono series, and there's no reason to include extras if it's going to make them suffer those load times.
I highly doubt DS extras would be included, but who knows? PSN Releases can be really interesting. Turtles in Time Re-Shelled, for example. And we already know they're reworking Chrono Trigger for iOS. Maybe they're doing more than they're telling us. Wouldn't be the first time!