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I found this scholarly article by Kate Crosby. To summarise the distinctive feature
Interestingly it appears to be using the Pali langauge itself as a focus for esoteric practices. It's practiced in Cambodia and Laos.
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This might interest you - http://journals.ub.uni-heidelberg.de/index.php/jiabs/article/view/9290/3151
Jump to p. 470 for the good stuff. From what I've read, it sounds like a blending of traditional indigenous religious practice mixed with Buddhism. In other words, it reads an awful lot like Vajrayana!
I also found this by Googling around - http://santidhammo.blogspot.com/2011/11/theravada-tantra.html.
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This particular tradition of practice is actually not based on Vajrayana practice, but is more of a mixture of traditional Theravada meditation with Hindu Tantra, not Buddhist Tantra, so there isn't any deity yoga, but is instead based on generating a nimitta made of light and then moving it around within one's body.