When entering dots (".") or colons (":") into the new combined address/search bar, the search is not performed as expected. It looks like there is an dependency for the colon error condition which is that the search term has also to contain a blank (" ").
I can workaround this issue by (double) clicking onto on of the search providers listed at the bottom of the address bar drop down, but this is not acceptable for productive use! At least I would expect a shortcut to always forward my input to the currently active search engine (i.e. Shift+Enter). - see Connect Feedback ID 601378