Again, sure, you have a bunch of maps that already "Fit the bill" with a "holiday" theme. I'm not trying to talk people out of this, I'm just trying to make sure you all fully think this through before you jump in. Here's some more of my thoughts.
1) Look at the community as a whole. Not just TF2M, but the WHOLE community. What type of maps do they want right now? Where is the community interest going to be in a few months? A year? What type of maps do they want in a few months/year? Maybe ask TF2 Members on reddit, or on SPUF.
2) I said it before, I'll say it again. Taking pre-existing maps will make for an "Okay" update, not an "SO AWESOME FUCK YEA!" update. Sure, it'll be really damn awesome for US, but we should map for just US. The update is for the community, not us. If you're making the Update to be about us, then the update will stink.
"You cannot take a bunch of bricks, throw them together and call them a Castle"
This is where the latest update kind of fell apart. It's pretty sweet that there was 57 new items, but they were all robo'ed up originals. Nothing was truely "new" ... which is why the update got a huge range of responses from the community.
3) Do you think that the current TF2Maps community could make a ValvE or higher quality update? Is the depth of knowledge needed to make such maps still in the community? Going to be honest here, based on what I've seen and read, you're a few months off from that.
4) What will you need to do for this update? What is all that is involved?
- Brainstorm a couple of theme idea's
- Develop a contact with Valve, see if they actually want this. Or any of your ideas
- If you don't want to do it with Valve, ignore the last bit.
- You need to keep people on track and on a time table, how will you do this?
- How many maps?
- Who will make them? You can't take all the ones entered.
- If you want uniform high quality across the board, then you need to set a standard. If the map does not meet that standard it MUST be turned down. Are you willing to tell mappers that spend months working on a map that "Sorry, it's just not good enough?"
And that is just the maps. For the release:
- You need a website programmer that can do quality websites
- You need a artist that can do quality art. Actually, you'll need a couple.
- You need a manager who can run and maintain a quality project
- Do you need a trailer? Then you need an animator who can do high quality stuff. Years of experience needed.
- You need a writer that can mimic Valve's writing style for TF2.
- You'll need multiples and back ups for these people who can maintain consistency.
- You need a PR person to handle all the public relations and hyping
The reason Valve had these guys specifically (Heartsman, Mnemo, Smashman) in for the update was because they had done this many times before, and have shown in the past that they can organize themselves and make the highest quality community update that they can.
If it's an older map, people are more likely to have played it, and thus already have made judgements on it. You'll lose people to update because it'll be like "Oh, I've seen this already" "Oh, this is meh." You lose the element of surprise wonder when you're teasing about it. "Oh, I've never seen this map before! I wonder what it could be!" instead of "Oh, I know that, it's that map by so and so."
tl;dr: Read the damn thing.