My money is on wasted airtime.
My predictions (these and five or ten dollars will buy you a cup of Starbucks coffee):
(1) He will not call for a border fence.
(2) He will not call for deporting illegals.
(3) He will announce new border security initiatives ... perhaps even involving the military.
(4) He will continue to press some sort of guest worker/path to citizenship approach.
If there is anything dramatic, it will be announcing the use of the military on the border. I heard on the news this morning that the Pentagon has been drawing up contingency plans.