There have been 3 Dwarves, 3 Rohan, 2 Gondor, 2 Dúnedain, 1 Noldor and 1 Silvan Heroes in the core set. As spoiled, there will be 2 Hobbit Heroes coming in the first two expansions. Plus, it has been hinted that Boromir (likely) as a Gondor Hero is coming in the fifth. I guess and hope there will be at least one more Elven (likely Silvan) Hero in the expansion 3 or 4. The remaining spot may probably be kept for another Dúnedain perhaps.
What do you think? Moreso, not just traits but names. We've just seen Éomund as an Ally and I bet for Éomer as a Hero. But how about an Elf? Thranduil, just to have another family bond covered? Or something more Noldor like Elrond? I think I read long ago that Elrond is going to be a Hero although thematically he seems more fit as an Ally. That doesn't mean much though as we've seen Denethor a Hero already.