Hey guys,
I just ran across this thread while doing some research on NHL 94. I actually do a lot of research into game release dates (I have a website and YouTube channel), and generally turn to Usenet to see when people start talking about having particular games in-hand. Here's what I found for NHL 94:
A post on September 8 talks about the game being "anxiously awaited", and states that the game's release date is the 24th of that month.
A post on September 14 quotes an exchange between the poster and someone working inside EA, who said that the release date was "the 24th or the 27th, I don't know exactly which." Interestingly, this person also said "EA was not "too cheap" to pay for NHL and NHLPA licensing in 1993; the NHL made it very complicated with all that player revenue business. Also, the NHL refused to sanction a game with fighting in it. It just wasn't worth the hassle. It didn't have much to do with money." Not sure if you guys already knew that or not, but I found it interesting because it explains both why NHLPA 93 lacked a license, and why NHL 94 lacked fighting.
A post on September 23 talks about having the game in-hand, and gives some first impressions. In another post on the same day, the poster says that he picked up the game "last night" and also gave his impressions.
From there on, there are plenty of posts about the game. So that's pretty rock-solid evidence that the game was first available on September 22/23, 1993. Hope you guys find that helpful/interesting!
Chris
Edit: For anyone interested, the newsgroup these game from was rec.games.video.sega. I was also able to find that NHL 94 for the Sega CD was released in January of 1994.