AndyCap The Trill Hex will be a 2D slider -- within the hexagon you get two axes of sensing, plus contact area. If you wanted to divide that up in software into smaller virtual keys you could.
If all you want is a single number for activation within each hexagon, you could make an isomorphic controller with a lot more hex keys using the Trill Craft, with one pad per hexagon.
@thetechnobear The interpolation can be done on the Trill chip, or you can request the raw sensor data. The former saves time and bandwidth but the latter lets you implement your own tracking algorithms.