I hope you all realize its the copyright that you are really worried about, and those last for a long ass time. Trademarks establish something used within trade, like a logo and name. Aetherbyte is trademarked. It's my mark used during trade. You don't trademark the contents of the game, and you don't trademark the word itself. You trademark the logo. The appearance and everything have to be documented and if you start using the word in a different style, you have to get a new trademark.
Neutopia's trademark being active is something entirely different. This would be an issue if you release something with NEUTOPIA all over it. It wouldn't even matter what you release, as long as it says Neutopia. In this case, it looks like you planned on using the Neutopia logo, so you're hosed right there. It's possible the trademark never actually ended. There'd be what a 2 year time frame where it may have been inactive and you announced Neutopia 3? For all we all know, they could have renewed it. I see it was renewed in 1993, so that makes it good til at least 2003. They probably renewed it. It's pocket change for them to protect their stuff.
You've been infringing on the copyright with Neutopia 3 since you announced it, as it never actually expired.
If they decide to pursue it, you can claim "they can't bully me" all you want. However, they have the funds and manpower to ream your ass open wider than Goatse's if they want to, as you are messing with their copyright and trademark all in one package.
A C&D is like a warning. "Stop doing this before we f*ck you up". I'd consider getting one of those before getting raped a blessing.
Publicity wouldn't likely benefit you anyways, as you'd be so f*cked financially that you'd have nowhere to go with it.
Court isn't free. Especially if you lose.
and that's if you even get publicity, This isn't Square Soft, and you're not jockin' Chrono Trigger. You'd have to do the work yourself to get people to notice probably. Post all over DigitPress and shit until enough people notice.
but even then, who's to say people outside of PCEFX would even give two shits.