Ah, speculation speculation!
The Caliber SRT4 may have been spec'ed at 285 HP but MANY Caliber SRT4 owners (ok, most if not all) that dynoed their cars found, much to their surprise and pleasure, that number to be a massive understatement. Most Calibers did at least that to the wheels. I think that's what put Ralph/SRT "Into the box" so to speak, with that "at least 300HP" number.
I'm assuming the 2.0, if it's turbo'ed, would be a more mainstream application, not SRT. Not 1.4 mainstream, but maybe "R/T" - There is no Dart R/T anymore officially, only the "GT" which was supposed to "Arrive Q2 2013" based on all those Travis Pastrana ads that stopped cold-turkey about 2-3 months ago. IF the GT is launched in the 2014 MY, that leaves room for the R/T and maybe an SRT.
Or will SRT skip the Dart, and wait for the Chrysler 200, and use the same 6-cyl engine in an SRT Cherokee instead of making an SRT Dart? The Dart will already have had what, 3 model years under its belt by that time (one of which was quite extended). SRT usually doesn't do products that close to end-of-life or refresh. I'd imagine the Dart will be under the knife by that point.
And if you think an SRT Cherokee sounds silly... the SRT Grand Cherokee and
Kermit-R Juke-R both disagree with you.