Go for the new bottle, mate! when I ordered mine from FragranceX a while back, part of me was hoping for the gold bottle, for reasons you described, the other part was hoping for the new, clear one. Again, for the same reasons you described. The bottle that arrived was the clear one and I couldn't be happier. It proved that FragranceX had new stock, too. Can you actually specify the old bottle when you order it?
I suppose the other issue is any fakes are likely to be the older gold bottles. Not that you'd source your stuff from any dubious suppliers! funnily enough, I have no problems with MI's longevity! Luscious, unctious, gorgeous stuff that it is!