Oh i hope you don't mean "Distros" like Linux :'-(I meant it the same way Haiku Inc does: some customized distribution that diverges from the official images. It's the same thing we had with, say, Be's R5 and TuneTracker's R5. Or Be's PE compared to PE Dev Ed, BeOS MAX and so on. (I too hope it won't turn into the Linux distro situation...)
I find that quite unprobable. I think the Haiku's distros will be similar to FreeBSD's ones, in which the whole system is standard and the applications bundled change.
About the Tracker default discussion, it's pretty much a Monty Python arguing, isn't it? It's all about taste, so it won't get anywhere.