According Stefania Duico, the lead of Windows Phone Italy, the Windows Phone Tango update will be officially called 7.5 Refresh. As you probably know, currently WP Mango is called just 7.5.
Adding the Refresh moniker and not changing the OS version actually makes sense, because this update major role is to lower the Windows Phone specs so less-capable devices could run it (without multi-tasking, live tiles, etc.).
The update will become available for every WP-based smartphone out there later this year. The next major release is Apollo a.k.a. Windows Phone 8. It will probably launch in Q3 this year.
will radar get the update of refresh and apollo?
The HTC Titan will receive the Windows Phone 7.5 Refresh and the Windows Phone 8 (Appolo) updates ! Microsoft has only said that the 1st generations of Windows Phones (HTC HD7, Samsung Omnia 7, HTC 7 Pro, LG Quantum, etc.) wouldn't have the Windows...
"somewhere" huh? Care to post where that "somewhere" is? From all the articles I've read Microsoft has been dodging the question like a bullet. In fact they won't even comment about WP8 compatibility with current devices.