Neither of "...and currently looking for more relationship partners" or "...and not currently looking for more relationship partners" seem to capture what I feel is a common poly sentiment, "...and I'll figure out what I want with new people as I get to know them".

It seems to me that unless a new person shows up and you say "sorry, not looking for more right now" you're in the first category. But separating out "looking and receptive," "not looking but receptive," and "neither looking nor receptive" seems potentially useful.