No, it is available only in landscape mode.
The DTK-2451 and DTH-2452 use the 100 x 200 mm VESA configuration with 6 mounting holes.
Yes. The units include a DVI-I to VGA cable for use with PCs that have VGA video connections.
The DTK-1651 pen is compatible with the DTK-2451 and DTH-2452 pen.
Please contact your Wacom sales professional, or send a message using the Contact form at the following link:
Please visit the Wacom Linux Project page: http://linuxwacom.sourceforge.net
Older Linux distributions might only support 2 finger touch; but modern distributions, running kernels 2.6.38 and newer, support multi-touch.
Yes, they do support ExpressKey in Linux.
Please visit the Wacom Developer Relations page: http://developer.wacom.com