I think some fans feared Spider-Island would be a re-trend of The Clone Saga and it was anything but. Slott has been touching upon past continuity though. I wouldn't exactly call it a re-trend, but he's been shifting through previous continuity and bringing back concepts and using them slightly different. This is one of the things that I've enjoyed most about his run thus far.
Bah, so he used the multiple Spider-Manish guys idea and bringing crazy ass Miles Waren and his band of clone minions back, he still has the is Parker's body or clone body or not and mysterious figures that tend to clash with a Spider-Man story and just go around being vague and in the end have f@#k all to do with the plot or its resolution and an endless molasses of lies, reconts, and general confusion to wade through and about a whole year to do it in.