The main things are:
Updated to match the latest search engine algorithm changes and let you avoid over optimization and search engine punishment
Daily search engine position monitoring tool
New keyword cloud tool
Works with all regional search engine versions (e.g. Google.co.uk)
New keyword presence report and updated keyword density charts
White-label reporting that you can re-brand under your name (Professional and Enterprise only)
Alexa rank display
Updated user interface and SEO guide
And screenshots can be seen here:
http://www.rapidseotool.com/highlights.php