
Briefly about the changes (from the description in the AppStore):
- Includes SDK for iOS 5.1 and MacOSX 10.7
- Signing up with Apple Developer ID
- Console utilities are installed from the download menu, see notes.
- Instruments, File Merge and other utilities now run directly from Xcode.
- ARC migration utility can convert code from retain / release and GC code
- Bugfixes and stability - as usual
The Mac OS X Lion version is available for free in the
AppStore . Version for Snow Leopard, apparently, will not.
The first thing that caught my eye was to install Xcode in / Applications, now the / Developer directory is not needed, all additional utilities are placed inside the Xcode.app bundle. At the same time, during the first launch, Xcode suggested sending the old version to the trash - and deleted the entire / Developer directory along with the installed Qt and other useful things. This is my personal warning for those who will be updated - do not settle for the demolition of the old version, if you put something in / Developer.
')
The second is that the Command Line Tools could not be installed from Xcode. Moreover, there is an item in the downloads, but you cannot install it (even with a paid Apple Developer ID). What upset. But, it turns out, you can download a separate package of the Command Line Tools directly from the
offsite (with unpaid Developer ID). So life goes on!

Another small little thing.
LLDB is now recommended as a debugger instead of the usual GDB. Well, let's see what comes of it.