I actually suspect that the Direwolf20 pack may end up picking up Ender IO, specifically because Direwolf20 has made one or two references to being curious about it in his videos. The mod author (CrazyPants), and numerous others helping via the GitHub, are plugging away at getting it ironed out and feature stable as quick as they can. CrazyPants has stated that his inspiration for Ender IO was Thermal Expansion, so hopefully there may end up being an 'MJ-using alternative' to the newly revised Thermal Expansion... if people decide that the do not like another power system.