If you are a registered FL Studio owner AND logged into your account then the offer should show in your shop 'Pay what you think they're worth'. The minimum you can enter is $12 USD to cover our back office costs.
This offer will get you Newtone AND Pitcher in the single purchase. It's not limited to the beta versions (both plugins are in beta testing with FL Studio 9.7 at the moment) you will also get the final release versions that install with future versions of FL Studio (e.g. FL Studio 10).
NOTE: Pitcher and Newtone will not be included free with FL Studio 10, they will remain additional purchases.