先看 "don't look now" 的原意:
used for telling someone to look at someone else, but not immediately because you do not want the other person to know you are talking about them
Don’t look now, but that man standing by the desk is Emma’s new boyfriend.
http://www.macmillandictionary.com/dictionary/british/look

有人理解为 seeing / facing up to something you don't want to see / can't believe：
Don't look now is all about 'seeing' the 'unseeable', 'believing' the 'unbelievable', confronting 'truths'.
So if this case, when the managers read this article they are going to be shocked, surprised, stunned etc, and are going to have to see things from a different perspective, accept something they didn't know existed etc....
http://www.proz.com/kudoz/English/other/503248-don\\\t_look_...

某论坛某人对 "don't look now, but " 的解释：
It is also a figurative expression that can mean something like "You may not be aware of the fact, but..." as in "Don't look now but they've just raised your taxes again." (Just to clarify, I don't think that it is being used figuratively here. I'm simply providing some additional information.)
更多信息:
http://club.topsage.com/thread-1287778-1-1.html

综上所述，字典里面说 "don't look now, but " 是一种口语表达，因此我建议也翻译成类似口语的表达，如"你别不相信"，"你可别不相信"，"说了你别不相信"，"你别不相信，且听我说来"，"说出来你别惊讶"。
如果直白地译成"别看现在"或"别现在看"，我觉得没有理解透彻，汉语的读者会不知所云。