As one of the first acts in office, my new boss moves my office mate out. The rationale is that the person will have "higher visibility" but I smell a lie. What should I surmise is the actual reason for the singling out from the rest of the department?
I think we need a bit more by way of background information before making any sort of informed observation on this.
Moves your office mate 'out' to where, exactly? Is this move seen as a promotion or demotion, or a sideways move? Where does that leave you - alone, in splendid isolation, twiddling your thumbs with newly bestowed professional importance, or alone in the sort of bubble where you are ignored? What does this move mean for both of you - were you both doing the same work before now, or were one of you reporting to the other?
What sort of work do you chaps do within the organisation and where does what you do lie on the organisation's chart, or organigram, or office hierarchy? Is any section (such as, say, yours) likely to be at risk, or due to be merged, or reduced in importance? Have similar moves taken place elsewhere in the organisation, and if so why? If not, why not?
Have any one of you had any sort of prior professional (or even personal) relationship with this new boss? Does he (or she) have their own people whom they may wish to appoint, or promote? Why was he or she appointed? Was he or she appointed to carry out a specific task, or tasks?
All of these questions occur to me, and it is impossible to give any sort of thoughtful response to your post unless you (not us) ask them, or similar questions, of yourself.