"Like previous Atom platforms, the current Bay Trail-T platform is 32-bit only, which makes sense given that version of Windows 8.1 with the Connected Standby features is currently 32-bit only, as is Android. In the first quarter of 2014, Intel plans to release a 64-bit version of Bay Trail-T; Microsoft is expected to deliver a 64-bit version of Windows 8.1 with Connected Standby around the same time. In his keynote, Doug Fisher, vice president and general manager of the Software and Services Group, said Intel would be adding 64-bit capabilities Android too.
The 64-bit Windows support, in particular, should be attractive to businesses. Organizations can use the same OS image for both Core-based laptops and Bay Trail tablets, and existing 32- and 64-bit applications will run fine on both platforms. In addition Intel has brought many of the security and management features in its Core processors over to Bay Trail-T for both Windows and Android tablets."