If its a decent market day tomorrow following the American holiday then it could happen. If its volatile, they'll push it out until Wednesday or Thursday hoping to take advantage of better conditions in which to release information.
If they have indeed responded to several callers that they intend to release the RE by month-end, I'm willing to take them at their word one last time. If they drop the straw again however, then consider this camel's back broken. Their word will be meaningless thereafter.
Regardless, their officially-stated deadline is quarter 2, so if they don't make it by May 31, they can simply fall back behind the "official" timeline and save face. If that happens, some of us may have a difficult time mustering any remaining shred of respect for management.
Long until the end (but running low on steam).