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There are many other interfaces. Please check and include into your analysis:
BrailleTye - Tiago Guerreiro - one tap at a time
TypeInBraille - Sergio Mascetti - two taps at a time - a row
Perkinput - Shiri Azenkot - three taps at a time - a column
SmartBraille - ??? - swipes and taps - ?
Radisbruder at youtube - Braille Dynamic Virtual Keyboard - six taps at a time - the full braille cell, just like BrailleTouch, but no user studies and published later than the first publication of BrailleTouch in July 2011.
3 years ago on Touch and type interfaces for the blind