To the people working on getting the game back or if the people here that know them pass along what's said,Please add more character slots :)I'm going to be making many more characters than before and with no new content making alts will be even
more important.
They could easily unlock them all for you, but it would be non-trivial for them to add more. So basically, although we all started with 8 (or 12) slots per server, the maximum you could unlock by various means was 48 (36 if you were F2P). Any operator of the game could, if they wanted to, just give those 48 slots away on day one. But they would be hard-pressed to alter the game in a way that allowed for more than 48 per server.
Of course, the other thing you could theoretically do is have multiple server clusters. They might be forced to have a Freedom, and a Justice, and a Triumph, but there's nothing to stop them from having two complete (and independent) server farms, or three, or whatever - of course limited by the resources they have to create server clusters. I suspect, though, that for most players having 576 character slots should hold you for a little while (assuming twelve servers and 48 slots per server; if they reinstance the EU servers it could be more).
Keep in mind I'm speaking about what's possible, not what the operators should do. They have to keep the lights on and servers aren't free, so charging for character slots might be something they decide to do. They might also decide to give away more slots for free than City of Heroes did, and then again they might not. Keeping in mind VIP (i.e. subscribers) got 144 character slots on day one, that's not bad (12 per server and 12 servers).
By the time of the shutdown I had like 30-something alts on Triumph. Sure anyone could fill a thousand character slots with empty costumes, but if you're actually playing the alt and not just power leveling a placeholder it actually takes a significant amount of time to play, and then exhaust, the character slot maximum even on a single server.