Lucky --
My SE status on NW was my first status on any airline -- and as such, I've followed the news of this merger for a while. From the NW elite side of the house, I think many of us are fairly concerned / upset about how DL has been practically giving away EQM's while NW has done nothing of the sort. DL ran a double EQM promo this past spring (along with AA/UA), while NW did not. This would obviously have had the effect of inflating the ranks of DL elites and / or artificially raising the status of a given DL elite, as compared to a NW elite. By my understanding, this isn't the first time that DL has done these sort of promos, and there might be others within the last qualification year.
There are some tangible differences between how NW and DL have run their FFPs. I've talked with high level DL elites (in Y) on DL flights, and they've said they almost NEVER sit up-front (due to the swelled ranks of DL elites). OTOH, I've been a SE on NW for several years, and probably have hit a 20-25% upgrade percentage -- not great, but certain not NEVER!
So I have to disagree with you on this one issue. From what I've read, the NW/DL merger isn't so much a merger as it is DL taking over NW. NewGlobalAirline is going to feel a lot more Delta than Northwest, I'm afraid, an I don't think that's a good thing.