Here are some release notes for 2.9b denoting changes from the last version (1.3.x):
New 3d struded text feature (as far as we know, not much about this on Android devices)
New 2d Brushes and improved performance
New tab pannel using Greendroid [official]
Bugfix loading fonts from SD card in some devices
Bugfix, IllegalThreadState when clickin' too fast in brush mode
Code clean out, refactors for easy development and maintenance
Code APIs separation and factory set.