It seems no news about the new firmware. I received a label a few days ago to return my defective BJ and I'm still debating whether to do it or wait for the firmware update which should fix its hardware problem. I'm getting impatient though and losing money everyday, so if there isn't any news soon I'll just send it back.
I was able to get my working 3 dies to hash at least near the specified hashrate (~375ghps at pool) by overlcocking and tweaks but it's not very efficient power wise, but I guess it's worth to overclock now and squeeze out whats possible as long as difficulty is still "low". Personally I don't expect them to release an updated firmware at all at this point, if it were near ready and they wanted us to have it, one would think somebody there would take the 2 minutes and put a post onto their blog, or send a twitter about it.
Edit: If you hashing with it now, imagine what happens if you send it back:
-3 days transfer in (or it will cost alot to ship) -> 3 days no hashing
-3 days transfer back -> 6 days no hashing
under the assumption, hashfast sends it back the minute they get it, after all, working lightning fast with customers is what they known of.
And under the assumption the replacement board you get is working right. It could be sub perf too. Or it could be not working at all.
By the time you sort that out, diff will have increased at least by 20% if not 20%^2 or ^3. And you possibly never mine the money back.