Well, here's the confirmation you've all been waiting for, it sounds like it definitely will one of those "It never happened" things. From SciFi Wire, notice the next to last sentence.
Fans Helped Renew Enterprise
Dawn Ostroff, UPN's president of entertainment, said that fan clamor was party responsible for the network's renewing Star Trek: Enterprise for a fourth season in a new timeslot, 9 p.m. ET/PT Fridays. "By the amount of mail and calls that we've received from loyal Star Trek fans, we have every reason to believe that the viewers will follow Enterprise to its new night and time," Ostroff told advertisers May 20 at the network's "upfront" presentation. "After all, this is a show that recently topped a USA Today poll, with 70 percent of the respondents voting for Enterprise to come back next season."
The new timeslot "is the same night and time where X-Files found its following and thrived for years," Ostroff added.
UPN officially picked up the ratings-challenged Enterprise, which had been "on the bubble" for weeks, meaning that its fate was uncertain. The network said that the new season will be "more action-packed, with spectacular special effects," and "will take Star Trek: Enterprise into further uncharted territory, while advancing last season's critically acclaimed storylines, including Vulcan Sub Commander T'Pol's (Jolene Blalock) blossoming relationship with Chief Engineer Charles 'Trip' Tucker III (Connor Trinneer) and mysterious twists in the familiar timeline ." The third-season finale of Enterprise, "Zero Hour," airs May 26 at 8 p.m.