Is there any chance for our private keys getting stolen when we import them in a possible rogue BitcoinABC wallet?
Yes. However, sticking to the official links posted by the OP should be OK, especially since the OP is a bitcointalk staff member. Plus, I don't think Bitmain, who backed the development of this coin, would sacrifice their reputation on releasing a trojan. But you never know in this crazy cryptocoin community.