Silverclaw is probably dead last on Hasbro's classic Avengers to-do list. She's deco and sculpting heavy and probably has the least comic book appearances than any other classic Avenger.
If I were to guess the order in which we might see the remaining classic Avengers, it would go like this, from most likely to least likely:
13 Classic Avengers:
Jim Hammond Human Torch
Swordsman
Mantis - not the classic version we collectively want
Jack of Hearts - although Dwight has mentioned the high cost of deco, I just have a funny feeling Jack is in development
Stingray
Two-Gun Kid - if the Phantom Rider rumor is correct, I think Two-Gun is the next western character
Firebird
Dr. Druid
Triathlon/3D Man
Gilgamesh
Living Lightning he's had very recent appearances in Avengers, so that may help his profile
Lionheart
Silverclaw