At some point, they're going to port Super Strength over to scrappers, I'm sure. I don't think they'll do that before they're happy with the way Rage works.
I don't know. I've gotten two Super Strength tanks to fifty and I didn't take Rage on either one. The mag 16 stun was just too risky for my tastes (and with six slotted acc/dam enhancements, if I remember correctly, they used to be +50% accuracy and +50% damage, and the tanker damage cap used to be 300%, so Rage was pointless) and on the new servers, I'd just gotten used to playing without it. I only kind of wish I had more damage when I hit a sapper with knock-out blow and have to use another attack.