Well, I started making some lists but only with new levels. I still have to look for some old levels but I will need some help with that.

Anyway, here are the levels I have so far (once again, so far I only searched for NEW levels). Some of these levels have a very big chance of being in the final packs.

Deinspirated Mayhem – Eigus - Eigus' best level (in my opinion)
Underworld - Eigus - it's quite small, but if there's nothing else that can replace it it can probably be in
Triton Armory - PurpleJazz - also small, but we've had more small levels in the Bash
4th Reich - SuperJazz - a level that won a contest, but it was the only entry.
The Curse - Snooze - a level that became quite popular when it was released
Starlit Basin - Ragnarok - one of the best Battle levels from last year
Rainforest Revelry – cooba and Ragnarok - it won the award for best Battle level in the JCS Awards
room of the snooze - DarkSonic - a lot of people don't know this. This is from my still upcoming pack. I try not to be biased but I think some people know why I put this in this list
Peaceful Fortification – DarkSonic - see room of the snooze
Lut Gholein – Snooze - one of the best Battle levels from last year that got played a few times in JDC events
Another Untitled Level – Jake - some Bashes have had not-so-serious levels so this could be in for lols
The Inventor - FawFul - very weird, but with a great concept and there have been more weird levels in previous Bashes

CTF:
Voltage Cable Malfunction - FawFul - this level shows that Faw became better after Planetary (;S)
The Canyon - Dodges - it was a bit overrated on J2O but could still be fun
Chemical Gases - FawFul - see Voltage Cable Malfunction
Server Room - Ktos - a really big level that could be good enough
Xyzzy - SuperJazz - despite the weird level name and layout this level could still be fun
Golem Landscapes - FireSworD - easily one of the best levels from 2009 and a must for the Bash. It won the Best CTF Award for a reason
Steam Machine + Landscape - Snooze - New Ages IV had some good levels, and out of the CTF ones I think this fits the Bash the best
Old Jungle - tropiCCo - not sure if this will make it, according to the reviews there are some people that don't like it that much (;S)
Fort Medina – Napoleon - another level that became quite popular in JDC events

There are some levels that didn't make this list:

Hard Cheese - FawFul - in my opinion this is the best CTF from Planetary, but Faw already has 2 CTF levels in the list that I (and there will be other people) like more
This level is.. gold! GOLD! - DarkSonic - a level that I already finished last year, but it didn't get in there. I don't think people know this anyway

Then there were some other levels from Planetary and New Ages IV, but both authors have a few levels in already. Snooze said he will make a new CTF for the Bash. About other people that will make new levels.. well, I don't really know. I asked Quickz if he wanted to make a level for the Bash but he didn't know yet (he basically quit JJ2)

Now, if there are suggestions for levels (new or old levels) then feel free to suggest them.