There are plenty of cycles on top of not only the multi-decadal oscillation, and the rise out of the Little Ice age. The biggest, of course, is the temperature rise out of the last real Ice Age some 12000 years ago. There’s nothing to say we aren’t nearing or at the peak of that warming trend too, and on our way back down into the freezer again.
“...and on our way back down into the freezer again.”
Looking at the past interglacial warm periods - our current period is a bit on the long side, so I would not be surprised if we are not due for a REAL, mile-thick ice over Seattle, Ice Age.
Some scientists think that these ice-age periods can kick-off in a matter of years-decades, not the hundreds to thousands of years one might think. (I have read other papers that talk about rapid cooling on the order of weeks to months as well - but not sure how much the data backs up their ideas).
http://www.universetoday.com/83906/younger-dryas/
http://www.esd.ornl.gov/projects/qen/nerc130k.html