Just announced this morning.

EFFECTIVE 3 JAN 06, SOLDIERS IN ZONES A, B AND C SERVING ON ACTIVE DUTY WHILE ASSIGNED OR ATTACHED TO UNITS IN AFGHANISTAN, IRAQ, OR KUWAIT IN SUPPORT OF OPERATION ENDURING FREEDOM OR OPERATION IRAQI FREEDOM WHO REENLIST MAY RECEIVE A 1.5A, 1B, OR 0.5C SRB. BONUS PAYMENTS AUTHORIZED UNDER THIS MESSAGE WILL BE PAID AT THE TIME OF REENLISTMENT IN LUMP SUM NOT TO EXCEED $15,000.

Also:

PFC MAY REENLIST FOR THE SRB MULTIPLIER FOR ZONE A IF OTHERWISE QUALIFIED.

SFC MAY REENLIST FOR THE SRB MULTIPLIER LISTED FOR ZONE B OR C IF OTHERWISE QUALIFIED.

Note: Normally, bonuses were only for SPC through SSG.

Here is the link to the actual MILPER Message:
https://perscomnd04.army.mil/MILPERmsgs.nsf/All+Documents/06-002?OpenDocument