While some of it is based on speculation, some new entries in the Fallout Wiki indicate that Bethesda and Interplay may be close to resolving their long-running lawsuit over the Fallout IP. This entry on the Fallout Wiki - a leak of a partial court transcript dated Dec. 12 - notes that Bethesda and Interplay have agreed to leave the Fallout trilogy out of the fight moving forward.
"Both sides have previously agreed to drop this from the case (Bethesda raised it, and Interplay agreed). The case now just concerns future Fallout games."
Another entry found here indicates that Bethesda has filed a motion to seal parts of the case. This is often an indication that an out of court settlement is probably in the works.
It will be interesting to see if all this proves to be true because it means that Bethesda and Interplay can get back to making games instead wasting money on lawyers...