Google says for the user who are using Internet Explorer 8 and they go to Google, the default settings will not be passed over SSL and hence the referrer data will pass fully to the Webmaster.
The SERPs of Google has been replaced virtually 100%SSL in previous year, consequences more than 90% result was not provided for the keyword data in analytics tools.
On the other hand if you use Internet Explorer 8 and go to Google, then you will not find the SSL enabled experience.
You can see there is http not https.
If you click on the search result on the referrer search, then you find the like this as screen shot is given below.
At the same time Matt Cutts warned the users there may be some certain changes to IE8 in future, hence this may happen. He expected that Google will not pass the source or any data during this sort of phase.