From MMAweekly

Speculation has been running rampid about a possible U.S show in March in Las Vegas. MMAWeekly.com can confirm that there will NOT be a show in March. No specific reason was given, but it's believed that the new date will be sometime after June and the card could feature a Heavyweight tournament. More details upcoming on MMAWeekly.com.

yeah with a show in February and then they'll probably do another bushido so June sounds about right.
The rumors for the February card have quite a few HWs so a tournament may be what they're working on.