
Yes, a local co-op mode will not be present in Mass Effect 3, this was confirmed in a meeting with producer Jesse Houston on BioWare’s company blog recently. Although, they did confirm that it’s something they are considering, but it’s just not on the list of things right now…
it is definitely on the table as something we might add
However, it’s likely that this will either be added on as a downloadable extra, or patched into the game post release date as it’s not something that everyone craves in this new internet age.
Source: BioWare Blog

