Merge pull request #521 from bhariharan/unstable23

Merge branch 'unstable' into unstable23
Adding What's New in 2.2
Change link to discussion forum
Fix URL
Merge pull request #522 from bhariharan/unstable

Adding What's New in 2.2
Minor rewording
Merge pull request #523 from bhariharan/unstable

Minor rewording
Merge branch 'unstable' into unstable23