Google says "this issue, and visits from Instant Preview will no longer show up in your Analytics account. We'll not be reprocessing the data to remove past visits, but you can use an advanced segment to see the visits from Instant Preview in the context of your total traffic." WebShare, has detailed this method, see below:
Option 1: Advanced segment:
Once the tainted data has been processed in Analytics, there's nothing we can do to reprocess it or change it. But we CAN change the way we view the data through Advanced Segments. All we need to do is take what we know about the traffic we want to single out within our reports and create a segment that matches it.
So, knowing that these sessions originate from a Service Provider called "google inc." and that these'll be short, single page visits, we could do something like this:
This segment (here's the link to this segment) will allow you to see exactly which components in your reports are originating from a Service Provider of "google inc." that've the conditions on a bot visit that we would expect. Is it perfectly, 100% accurate? Nope. But it'll give you a baseline to see how this might be affecting you. We've found this to be a relatively small percentage of visits across accounts thus far…here's an example: