Lead Developer Paul Sage has written up an informative entry to the Tabula Rasa community site detailing the specifics of Tabula Rasa's endgame and what to expect at the upper levels.

# Personal Armor Units (PAU's): When players get to level 40, they won't just get a pony! Promotion to Level 40 comes with the option to train for certification in the PAU. Each PAU will have bonuses such as movement, more firepower, and different abilities per type. Each type is unique to the military career the player has selected. When visualizing the PAU, visualize the AFS Mech, although each will be very different... and may not necessarily be a mech.

Sneak peek: PAU for the Grenadier: Grendel - The surprisingly nimble Grendel, has two machine gun turrets on each arm, providing a cone of doom a short distance in front of the Grendel. More impressive is the Hornet's Nest capability of the Grendel, which when unleashed uses the remaining power of the user to determine the number of rockets unleashed on the opposing forces but does massive damage to surrounding units.

Sounds like really interesting stuff, for the rest of the goodies, check out the full entry here.