The plan as it stood last time I was speaking to the BAA people, was that it would be moved to be a gate guardian at T5 alongside the new M25 spur road.
I guess it will move to that area in the next year or two.
It will never be open to the public. Its interior was removed when they used it to prototype fit the new toilets that were to be fitted fleet wide in 2002/3. Sadly that plan never happend, and the Galleys and lavs were sold at the recent auction