It appears the conspiracy theory I mentioned earlier was correct... today in our weekly meeting my boss mentioned that another colleague and I will be moving next to each other, in a few weeks. The irony is that I will be moving across the hall from my current office, to an interior corner. I'm not sure what my current officemate will do - if he stays I'm sure he'll get another officemate. But I suspect he'll be moved as well thus clearing our nice large office with the two walls of windows, for a manager-type.
I just had the feeling something was going on with the original mention/offer of getting an office. Oh well, it will be nice to have my own office.