Houston, we have lift-off! This teardown has achieved first stage separation.

On initial inspection, the 15" MBP looks ... like a scaled up version of the 13" model. We do notice a difference in the battery layout, but overall it's like looking at twins.

Look who we ran into again! The connector to nowhere.

We'd still rather see a removable/upgradeable SSD, particularly in a machine targeted at pros—but this way if your logic board bites the dust, there might at least be a chance of recovering your data with Apple's help. Keep making those backups though.