Version 3.5 drivers have now been released for the AJA Xena card, adding the option of capturing DVCPro HD directly. Plus users of Kona cards (AJA's Mac-based capture cards) can now use the Windows driver versions if using a dual boot setup.
AJA's release notes:

Update to XENA LH and LHe products. This release adds DVCProHD capture/edit/playback support. This release also removes licensing restrictions that prevented XENA software and plug-ins from working with hardware sold as KONA (certain models); now all of the following cards can be used in Windows with the retail XENA software:  KONA LS/LSe, KONA LH/LHe, and KONA 3/3x. Assemble Edit features have also been added to Machina and to the AJA capture Plug-in in Premiere Pro as part of this release. Please read the release notes for information on other fixes and improvements.

For further details and download links, see the AJA support site.