Yes but only one or two small servos under a light load. To power more servos, connect a DC adapter to the DC connector on the Servo Expansion.
The Servo Expansion can draw power from the micro-usb connected on the Expansion Dock. It should be enough to power one or two small servos that have a very light load. The worst that can happen is that the servos do not get enough current to hold up their load, which is bad for the servo in the long-term. It is highly unlikely that this will damage the Omega.
However, the Servo Expansion has a DC connector for an external DC adapter for powering just the servos. This is required when running several several servos under anything more than a minimal load. The adapter's maximum voltage is 5V.