Ok, as per CZ's tweet they have started testing trading now. So let's see how it goes. I'm pretty sure that prior to going on production, they have implemented much tougher security. They've learned a valuable lesson's from the hack and that is why Binance remains that top exchange because they improved things around their exchanges. Unlike those exchanges that have been hacked before, they usually closed, and didn't refund their customers.
They really need to change their security expert; any security expert that is a guru should be able to think out of box, thinking out of box in the sense that, he should be smart enough to know every loop holes that a hacker can use to break the system down.
If they had used a better security expert, it is not now that a hacker should be showing them where the security bridge is for them to start learning on how to fix them. I just hope that this time around, they have no loopholes left for these hackers to take advantage of again, otherwise, if this befalls them second time, they might lose their reputation completely.