This particular aspect hasn't changed, you cannot take data from the previous record. It may be possible through macros, as Floris suggested above. However, macros aren't officially supported and can be unreliable, so if you use them, you do so at your own risks.

There is, however, a new CHANGED command that you can use to verify if the new record has changed from the previous one. So you could use something like this:

IF(CHANGED([MyField]), "The field has changed.", "The field has not changed.")

It would display "The field has changed." if it did change, or "The field has not changed." if it hasn't.

Hope that helps!