the Disney Blog today stated that MSEP is now on an "open ended run" meaning it's going to be around for a while - well beyond the ending of Summer Nightastic. No idea how long that will be, but supposedly keeping MSEP around will allow Spectro to undergo a much needed extensive refurb. So, this might be for 2 months or a year. No way of knowing. Spectro should be back at some point, but, for now, enjoy MSEP.

Press Release