Now that I'm on my computer, I'm able to properly write my thoughts.
I think this marketing strategy is terrible. Not coming from someone who is waiting for their LI to be romanced, but objectively, it really is especially if one of the writers has to wonder why they haven't been revealed yet.
We had Cassandra and Cullen known for AGES. Although their sexuality (which imo was rather obvious) wasn't announced back then, they were two very well known returning characters with a large fanbase.
Now we have the last two, because there was no consistency in the revelations, and everyone with the exception of Varric has a relatively fresh and minor fanbase. A lot of people don't even want to romance Varric because they're too used to seeing him as a friend and there's a lot of sort of things holding him back from perhaps being an LI. He's very up in the air.
We might possibly not get to know who the last two LIs are until a month from release, going with how long ago Cassandra/Cullen were known to be romanceable.
I just hope that's the worst case scenario and that we find out sooner rather than later. There's no particular "mystery" about this. If you had left Cassandra until the end, sure, maybe. But 3/4 of the characters left are new and have fresh fanbases and it's just causing either anxiety or apathy. Or both.