The 1197’s will still be produced through the 2010 model year, so I doubt that you will see them on sale.
Differences in the 997c Si and 998c Si:
* Faster processor
* Video Out port
* Ethernet port
* ContourXD base map
Changes that will come with the 998c Si but can be added to the 997c Si units with a software update:
* SwitchFire (this is the renamed TVG menu)
* LakeMaster map card compatibility along with their special features
* Waypoint Management System