The keyboard above the PSR2100 is the new PSR1K (I think that's the right model number). I reported on this Karaoke model at the NAMM show this past January. It will be around $400 - $500. It features a mic attached to a special clip (you can see this in the picture), a smart media card slot (you can see this on the back if you look very closely). It will have lyrics on the screen and a mic input, but no harmony. It has an accompanament section and a new feature which allows you to play anything on the keyboard and you can't play a wrong note if you try.
George Kaye
Kaye's Music Scene
Reseda, California