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If you are running the dev preview from last summer then yes, there are noticeable changes. If you have some more recent build (from this year) then probably no.

For one, the dev preview expires in 10 days.

Microsoft extended it to Jan 15 2013: http://support.microsoft.com/kb/2671501

I would like to know if there is a way upgrade from the developer preview to the consumer preview? I have been using Windows 8 as my primary OS for last 4 months and don't want to do a clean install...

In the same boat. The can i upgrade... entry at http://windows.microsoft.com/en-US/windows-8/faq suggests that you could just as well do a clean install.