Basically pendragon and icefrog were both on dota-allstars.com
Pendragon then started to work on LoL and wanted to turn the website into promoting LoL and basically said fuck you to Icefrog
Icefrog moves to playdota.com and that is currently where dota is being developed and where sneak peaks of 6.68 are happening
It's a rumor that Icefrog has worked to developed HoN but does it really matter? There's something called money in this world which everybody needs.
Doesn't really affect us that much either, we will continue to play dota, HoN players will continue to play HoN, and LoL players will play LoL.