I have done a clean install from Ubuntu 11.10 to 12.04. When I open the dash with the super key in 11.10, I used to tab between all the lenses. However in 12.04 this seems to have been disabled.
How do I enable it?
Ctrl-Tab Move to the next lens (When the dash is open)
See this link for more details. LINK HERE!!
I really encourage you to look at that link, there's several people who have made screen shots or guides for the new shortcuts. There's also a working tool where you can hold the super key a little longer and it pops up a guide. (Not sure if that's implimented yet, I want to check when I get home though.)
Hope this works for you. Cheers.