My 2 cents:
Back in the 90s, Interplay had it's crap together. They made some great games, like that Star Trek game I enjoyed and the Fallout series.
Sadly, fast forward two decades later, and that's hardly the case anymore. A shell of its former self, they sold one of the few things it had going for itself - the Fallout IP - to keep itself afloat.
In comes Bethesda, and although their Fallout games are still filled with bugs, they took that IP they purchased and ran with it. And made (so far) a couple of games that won several awards. Whether you agree with the direction they took the game or not, you can't argue with awards.
Now, however, it seems as though Interplay is trying to capitalize on the success and IP of another studio. Certainly, the company (well, those that worked there at the time) created the IP in the first place, but Interplay sold it for some quick cash; whether they regret that choice now or not is irrelevant. Bethesda paid for the IP, and they have the say in what happens with it.
IMPO, Bethesda (asa company) is being a bit dickish, but rightfully so. Being the IP holders, Interplay should be playing by Bethesda's dictate of the IP. Anything less is just unfair to Bethesda, who already paid a good sum of money to have the IP in the first place.