The folks at Pirahna GAmes have released a new developer diary for MechWarrior Online which covers the basics of piloting your Mech along with providing more information about heat management, weapon grouping, and some other basic info to whet your appetite for the game.
If that footage has you worked up to play the game you can head over to the website for the game and pre-order one of the founders packages for the game which will grant you immediate access to the beta of the game along with a wide assortment of other goodies.