Your guess is as good as ours as to what Microsoft's currently teasing on Twitter. So far, they've only said "Don’t be so touchy…flat is where it’s at." Maybe it's a new Zune HD. Or maybe it's a Windows Phone 7 device. (But with Microsoft branding!?!?) A tablet? An e-reader? Some sort of trackpad? Search us, but we'll be keeping an eye on it, for sure. [via @msfthardware]

Update: So Neowin is reporting that this lil' gizmo is the new Microsoft Arc Touch Mouse, which supposedly features a multi-touch track pad on top and acts as a mouse otherwise. This is reportedly to take advantage of the multi-touch features of Windows 7 without investing in an expensive screen. Sounds cool. It's supposed to be available in September.  -Malatesta