Trackball under one thumb would be awesome. Then split the keyboard to have two independent parts so you can type with your arms parallel (even better, add a half-keyboard holder at the end of each of your chair armrests).
There's some photos on my blog with the development PCBs (just got the production ready ones in and am shipping them out). Cases are in the works :)
I'm actually planning on adding additional modules (there's I2C contacts on every switch). And the trackpoint is next on my list.
(I want it, too, but it's kinda pricey)
I know they claim that orders are shipping immediately, but a co-worker waited over a year for his.