Just got the call today, BCT for March 19th, but I have to go back to MEPS to renegotiate. Funnily enough I saw this ship date on futuresoldiers.com site before my recruiter called me, so if your date was blank and changed suddenly it seems like a good way to gauge what's at least the tentative date.
Question to those that renegotiated: were you able to pick a new MOS? Or is this just a means to reset the clock on the contract?