I would rather see either words or symbols before I see both. When I see both I end up parsing the word twice, and it just feels redundant.
I personally like the way they are now more than I would like them with words or both. The rearrangement of the card attributes (speed, range, and target) threw me at first, but that's only because I was used to the print & play versions.
Silverleaf, have you tried just running with 'bird' and 'turtle' as the names for the powers? As in "Bird powers happen, then invaders attack, and then turtle powers happen" I know I do that for a couple of games. For example, Dungeon Lords has a resource that they call 'reputation' but my family refers to as 'evil'. And becoming less evil is sometimes referred to as 'gaining happiness' because of the iconography. We call the thieves 'trapmasters' for similar reasons (also, we refer to the Paladin as 'spawning', despite that being a totally inaccurate descriptor for any number of reasons). And in Ticket to Ride, we refer to the wild cards (officially Engines, I believe) exclusively as "Shinies". In Settlers of Catan I know of nobody who actually calls the lumber "lumber", and mostly the "grain" is "wheat". As long as everyone at the table knows what you are talking about, the proper names of things don't actually matter too much.
I'd like to see better positioning on Harbingers of the Lighting, though. The symbols on that card are too high, especially the two fear symbols. Because of their location on the card and the aren't centered vertically with the text they pull away from the rules text that they are part of and make it a little difficult to understand.
Finally, the 'Fear' icon doesn't say 'fear' to me. It's a shield with some weapons behind it - to me that says 'battle', 'damage', or 'defend', but it doesn't seem scary enough to be 'fear'.