Im gonna stop you right there.
This was their advertisement for the expansion prominently featured on their website from the announcement of the DLC. *see edit* Was linked to the image via bungie forums leading me to beleive it was in an official capacity. It wasn't.
So yes. Yes they did in fact advertise it as having a raid. At this point somebody should be suing their asses for false advertising. This shit has gone on long enough.
Edit: apparently this ad was not an official reveal but a leak of some sort. I was linked to this ad on bungie.net forums when I asked about the expansion last month leading me to believe it was in an official capacity. Apparently it's not.
That said they had some really misleading advertising about the game prior to release that still feels like it could be worthy of a lawsuit for false advertising.