"There are no private betas released of mirc."
I know some versions of mIRC have had private beta testing. When 6.0 was released, and everyone complained about the beveled edge on the chat box, Many moderators on this forum, and some unfamiliar people said that they had been using it for weeks/months before release; and that we would eventually get used to it, as they had done. I'm sure there are private beta's in circulation now, However, the testers are probably sworn to secrecy. Heh, these are probably the same people who show little patience with people who ask when the next version is released.