According to a GSN on-air advertisement, the third season of Idiotest will premiere in April. No date or time was given. Thank you to one of our Twitter followers (backed up by another) for pointing this out.
Idiotest was previously announced to premiere in January, but was later pulled back. Idiotest premiering in April is much, much more likely since Skin Wars is premiereing in April (according to several Skin Wars promos which air multiple times per programming hour).