It's not the worst case scenario for the Mets, but it's not good news either.
From Adam Rubin of ESPN New York:
Terry Collins says no surgery for Travis d'Arnaud. Out approximately eight weeks. #mets— Adam Rubin (@AdamRubinESPN) April 19, 2013
Travis d'Arnaud, who was playing in Triple-A Las Vegas, suffered a non-displaced fracture of the first metatarsal in his left foot on Wednesday night in a game against the Sacramento River Cats while catching.
The 24-year-old catcher was already unlikely to be up before mid-June due to service time and Super Two issues, but now his MLB debut will likely be even further delayed.
It's important to point out that Pedroia, after suffering the injury on June 24 of that year, came back on August 17, only to aggravate the injury, get put back on the DL two days later, and miss the rest of the season.
Given that d'Arnaud has to put more stress on his foot by virtue of being a catcher, he may well need more than eight weeks to get ready.
Combined with the fact that the Mets would not immediately promote him to the big leagues after he's recovered from the injury, it seems unlikely he'll be on the big club before the All-Star break.