A WebmasterWorld thread has some SEOs and webmasters noticing that the data in Google Webmaster Tools is updated faster than what they see in Google's own search results.
For example, Google Webmaster Tools may show that they have indexed 10,000 pages but when you check Google search, it may only show 6,000 pages. Keep in mind, I am assuming these webmasters are savvy enough to understand that a Google site command is not accurate and shouldn't be used to compare index saturation in Google compared to Google Webmaster Tools.
One member said in the forums:
Despite Google Webmaster Tools saying all pages are indexed from submitted site map on our accountancy firms website, google search servers don’t seem to be showing updated results anywhere near as fast as they use to. This includes change to titles, descriptions, rich snippets and content.
So from GWT it looks like they are indexing just as fast, it's just the results index is not being processed as quickly.
Also seeing more and more sync issues with their servers. Some queries often produce older titles than others – including updates to places company names.
Others have confirmed this but I am not personally able to verify this. Do you agree?
Forum discussion at WebmasterWorld.