Its not much of a difference but it has 260hp not 290 (and 260lbft as well), unless they are marketing them differently north of the border. Same engine as the Solstice GXP convertible, Saturn Sky Redline, HHR SS, Cobalt SS, etc... 2.0 Direct Injected Turbo. I've driven both the 5-speed manual and the five speed automatic. They are both nice. Outward visibility in the coupe is rather poor. No worse really than the convertibles with the top up or my TR8 FHC for that matter, but not stellar, with huge blind-spots. The placement of the antenna seems like an afterthought on the coupes as well. Very nice color though!
There is a fairly active Solstice forum. Lots of speculation on the exact number of coupes made, especially between GXP vs Standard. There seem to be a good many dealers throwing unsubstantiated production numbers around and GM seems to be keeping quiet about the exact numbers. There was even speculation of a 2010 production run but according to one of the members on that Forum, that worked at the Wilmington Delaware production plant, the plant is closed and locked up.
If you keep yours standard, unmodified, it could become even rarer. There seem to be many that are being heavily modified from the get go.
Tony, I don't believe there are any plans for a Sky Coupe. There are some aftermarket hard tops supposedly in the works. The Sky's were made in the same Delaware plant as the Solstice and I haven't heard any news about what Penske plans to do with Saturn, but I wouldn't be too surprised to see a Saturn name plate in NASCAR in the next couple of years. You might be aware that the Saturn Sky (which was designed in an Opel studio in Coventry) shares the same body work as the modern Opel GT, there is even a KIA version identical except for badging, not being sold in the US.