I cannot be 100%, but I believe at least some of the current 17" MBPs use the same panels as the previous two versions. The Hi-res ones obviously use a different panel. The 15"-ers before LED, used the same panels, but Apple added at least one extra model.
All the 17" displays have different part numbers from Apple, but you cannot buy the panels on their own. Have to swap the whole lid.
To answer your question literally, I believe they are still using the same 1680 panel, but they might not be using just that one.