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Vivendi Studios is the large company that owns Interplay (and Blizzard and a few others for that matter).

When Vivendi owns Interplay, it does not own Blizzard, which is an independant company. It publishes console versions of Blizzard games but that's all.

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If Interplay's figures don't look up, Viv'll probably do the same thing they did to BiS. Also, Interplay's inder a strict contract with Viv, disallowing most transfers of intellectual property (F3 source code, etc.) without express permission from Vivendi. At least, that's what I heard straight from former Black Isle devs in the days after Van Buren (F3) was cancelled.

Fallout 3 is already in production. Interplay hired some company to make it, I have no idea which, but my closest guess would be Silver Style.
Also, BG: Dark Alliance 2 sells very well, hence Interplay is not yet closing.