I just purchased the 8pen keyboard last night, and one frustration I'm having is that I keep having to look around my finger to figure out where the next letter is.
I found this blog post from November saying that the keyboard was now free and also updated to, among other things, include a preview popup that would show where the letters are.
The bit about the app being free is definitely outdated, as there is no free app on the marketplace and the links it includes are dead. It would seem that the preview popup is also gone.
I'm hoping someone can help me either to get the preview popup in my version (2.0.3), or help me find the version that has the preview popup.