I'm looking at replacing my Z-2 and I am up in the air on whether I should wait to get the 150 or just go with the 140? From what I have read, the 140 uses all the same cables and accessories as the Z-2 (XM, Sirius) does it use the same harnesses? I It be nice if I could just leave all that stuff and replace just the unit itself. I know the 150 is new but what does it have over the 140 that makes me need to wait for it? I'm just not sure. I know it uses a new hybrid sirius tuner and from what I could read it sounds like all the other wiring is new too? Is that right?

if you are going to buy it new, wait for the z150bh. Looks like significant improvement to navi and ui over previous generations. There are several other threads here discussing the features of new 50's series. 

I'm looking at replacing my Z-2 and I am up in the air on whether I should wait to get the 150 or just go with the 140? From what I have read, the 140 uses all the same cables and accessories as the Z-2 (XM, Sirius) does it use the same harnesses? I It be nice if I could just leave all that stuff and replace just the unit itself. I know the 150 is new but what does it have over the 140 that makes me need to wait for it? I'm just not sure. I know it uses a new hybrid sirius tuner and from what I could read it sounds like all the other wiring is new too? Is that right?

I have a Z2 and was looking at doing the same thing.  But looking at the rear of it and rear of a Z140 the plugs for the cables look much different.  Am I missing something?