Edging closer to what could be a July or early August release, Microsoft has released the Windows Mobile 6.5 SDK for developers.
The Windows Mobile 6.5 Developer Tool Kit adds documentation, sample code, header and library files, emulator images and tools to Visual Studio that let you build applications for Windows Mobile 6.5. This document contains important information about this package. For general information about writing software for Windows Mobile, please see the Windows Mobile Developer Center. The Windows Mobile 6 SDK must also be installed in order to use any of the Windows Mobile 6.5 Gesture API or samples. Windows Mobile 6.5 Developer Tool Kit comes with Emulator Images.
A new set of APIs is being introduced that will enable application developers to take advantage of the new Windows Mobile 6.5 touch gesture framework. The gesture APIs allow an application to handle touch gesture input and provide a visually consistent experience with the rest of the device UI. Note that the gesture APIs are only available on the Windows Mobile Classic and Professional SKUs. The headers and libraries are installed in the Windows Mobile SDK\Pocket PC\ folder. Samples that make use of these APIs are installed into the Windows Mobile 6.5 Developer Tool Kit\Samples\ folder.
Download the package from Microsoft here.