How long more?

[mwm7864]

hi i am a GC holder i filled I130 for my wife its approved uscis forwarded to NVC now i have provided everything Nvc require b4 they send an interview date NVC case status check phone line it says case is completed on 01/15/2010.now the question is while on visa bulletin my wife case priority date stil 5 months any one could tell me if we have to wait till priority date comes current to get an interview or ll get the interview letter any day now since case is complete ? im thinking visa bulletins dates maynot be accurate.
any info will be appreciated.thanks