It is pretty new, I think it came out last fall. Most of my 690 stuff works with it, the template bushings, the extra sub bases, and most everything else works with it.
I think the only true 890 series accessory right now is the above the table height adjuster. I received mine free as part of a promotion that PC was having, and it is an OK feature, but I am so used to getting down on my one knee and checking bit height anyway that I could live without it. It's their way of competing with the aftermarket router lifts.
The one annoying difference between my 690 and 890 are the screws that hold the baseplate on are different threads. So, if I'm taking my circle cutter jig of one, to put on the other, I have to make sure that I keep the screws sorted out.
I do like this router, especially the soft start feature. Going from a fixed speed to a soft start variable speed router is like night and day.