What makes you say March boku? The fact that he would not comit to either date just means that they are both wrong.
I suspect that if they don't get release 1.0 out by mid Feb then we may well be seeing Beta 5 after all. I doubt that they will allow the current beta to expire at the end of Feb without producing a replacment (there would likely be a riot!)
To be honest I would rather wait and have stable - optimized product than one that has been rushed out of the door due to promised dates. However I do share the frustrations of many Lightroom users waiting for a product that was initaly due the end of last year. The carrot has been dangling for so long I am thinking I may prefer a potato intead....
Either way I am betting on Mid-Feb either for the release or another beta.
With Michael and Jeff having already filmed their tutorial DVD It can't be too far off surely?