Steven Long has one for
Mythic Hero, a supplement for Hero.
As a long time Hero supporter, I'm already pledged on this one. I fear it will struggle - the price point is high. Steve has been honest enough to lay out how he came to his pricing goals.
It's also going to be a huge book - how much have we spent as gamers to get 300-400 pages of material? Steve's past work has been very solid, so this will, I expect, be a solid product if it goes ahead.
It will also, I expect, have a lot of use for non-Hero gamers. A discussion on building a pantheon seems pretty useful for any fantasy world-builder, whether in Hero, d20 or otherwise. And all those Mythoi, researched and described, would make it pretty easy to assign domains to Aztec, Hindu or Sumerian (to select just three) deities for a d20 game, campaign or nation. Any Fantasy gamer can likely make use of such a resource.
Check it out - maybe it's a good add for your gaming library!