Thinking hard about purchasing a 536HP, but what is the likelihood that there will be a NXDN firmware update? I'd hate to buy this one with a new uniden product on the horizon that would decode this and I'd have to buy later. I realize the 536hp has been out a while. Also considering a TRX-2 Whistler, but I have a long line of Uniden scanners in my history. Apologies if this has been asked, but I didn't see anything recent.