HoN already has some good Secrecy cards in it. They just don't have "Secrecy" printed on them. Wealth of Gondor? Free resources for the impoverished 2-hero Secrecy deck! Master of Lore?! He's like a permanent "Secrecy" discount. Instead of restricting cards into decks designed around the Secrecy mechanic (like that silly Dunedain Wanderer), the developers are putting out more flexible cards that can find a home in non-Secrecy decks as well. That sort of robust design is a big step up from the one-trick-pony cards that we saw in the Core set, currently gathering dust in your game box.
Btw, HoN has a good card for secrecy - Damrod. He can be exremely useful on a secrecy deck, but he is just too expensive. The lack of the secrecy keyword on him is a missed opportunity.
I agree that Damrod is perfect for a Secrey deck. And that is why I think there should NOT be a Secrecy discount on him. His effect is potentially very powerful, and 4 resources is a reasonable price even for a Secrecy deck, especially considering that he can pull his weight as a well-rounded ally until you need to trigger his effect.
If we discount every card with a potential Secrecy use, eventually we will end up with a card pool capable of making decks that completely neutralize the resource disadvantage of having only 2 heroes.
If you slap "Secrecy 2" on Damrod, he becomes a no-brainer, must-include card that can potentially reduce your threat by 10 -- or more! -- for a paltry cost of 2 resources--- way too powerful! His effect would work great as an event, but you get him as an ally too… super bonus! Even Secrecy 1 would be too high.
You don't have to print "Secrecy" on a card in order to make it good for a Secrecy deck. Damrod is a good example of a card that makes you think/plan/sacrifice in order to gain his full benefit. I'm fully convinced that the developers have NOT forgotten Secrecy, and they are approaching it with the long-term in mind. We didn't see the Secrecy keyword at all in HoN, but HoN gave us some fantastic cards for a Secrecy deck.