XLN Audio has released Addictive Drums v1.0. It is available now for Windows and Mac OS X in VST, AU and RTAS plug-in formats and has an MSRP of €225 (private; 25% Swedish VAT included), €180 (company; VAT excluded), $239 (international; VAT excluded) and can be purchased from the XLN Audio online shop or from their distributors.
A demo version is also now available. It weighs in at a hefty 180 MB download but it is fully functional software so it is effectively a free version. You can load and save presets, get a taste of the Beats and Fills (MIDI Library) and tweak away on the built in insert effects and reverbs, etc. It includes some presets that give you a good idea of what AD is capable off. It is not time limited. Use it as much as you want whenever you want.