The rumors are heating up slowly, with Microsoft soon to announce a Mango beta for developers, and this week we're hearing two new ones.



From Neowin:

First off, Mango is rumored to not require hardware buttons, and second, we've heard that the next update in line after Mango is to be entitled "Tango."

WMPoweruser reports that a "Russian sage" by the name of Murtazin, a famous (and reputable) blogger tweeted

  WP7: Hardware buttons no longer required, Mango successor named Tango