Professionals, Acer's Iconia W4 Windows 8.1 tablet is official bringing an optional keyboard and more.

Following the weeks of rumors and public appearances, Acer’s Iconia W4 Windows 8.1 tablet, the successor of the W3, is available this month, starting at $330 with 32GB
of built-in storage and $380 for the 64GB model.
It brings 1,280 x 800 display; lighter (0.91 pounds instead of 1.1) and thinner, (0.42 inch versus 0.45). The W4 also includes a 5MP main shooter, micro-USB, micro-HDMI and a microSD slot.