FAI 2.6.7 only includes a minor (?) update. Support for preseeding debconf data is now implemented. Therefore the new task debconf was created. Have a look at fai-debconf(8) for more details. Currently the examples inside FAI do not use debconf preseeding.
New in FAI 2.6.7 - add task debconf and new script fai-debconf for preseeding - minor updates in the fai guide -- regards Thomas