...the hell? Well, I can't say I'm too surprised reading if that is true that Parker got killed off or something (first time I've heard of this), but this is not too uncommon in the common book world. How many supergirls, robins, green lanterns (well that's a very bad example there since there is more than one in general), etc. have there been and will there be?
Still Dr. Octopus filling in for Spiderman? Seriously? Might as well have gotten Deadpool instead. I can see that the folks up high (and low from time to time) want something new but, this is getting out of hand (disregarding whatever it is that I've heard has been going on with DCs 52 series).
In any case, Mary Jane has nothing to explain as far as I'm concerned. If anything she should be telling us why didn't she put the costume on sooner. If this is really going on, I can't wait for her to run into Deadpool. She's really going to be in for it.