After some time of playing I've noticed a lot of ocelots (see crash raport and screenshots). Most of the time I'm inside jungle biome. This started to happen since snapshot 13w18a, using 13w17a makes most of the ocelots despawn after a while.
Steps to reproduce:
Not despawning:
1. Spawn an ocelot.
2. Walk more than 128 blocks away from it.
3. Go back and see it hasn't despawned.Jungle accumulating:
1. Find a Jungle biome.
2. Make sure you play at least on "easy".
3. Fly more than 128 blocks above ground.
4. Stay there for some time.
5. Fly down and watch Ocelots are all over the Jungle.
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Different issue than MC-4061 after all. Caused indeed by ocelots not despawning.

Confirmed.

Well they are called oce/lots/.
(Sorry)

I confirm the bug too. I'have encountered it in the latest snapshot, as you can see here: http://tof.canardpc.com/view/b9001ea0-6c8c-4525-9cd6-56e5c19f6a8e.jpg
More than 1000 entities, and it has reached nearly 2000 after some time around the jungle.
Please fix this issue, this causes extreme lag.

I have thousands of Ocelots right outside my house... well, some of them inside too. This in vanilla, single player PC version. Started with 13w18a.

this was quite a while ago. last time i played the number was above 1000.
they seem to center around this farm you see on the picture, but that could be because they can't get out after they went in and wont de-spawn.

yeah i have those as well. i can send the seed but i am not that good at looking which region files i should send and the complete map is not going to work(it is over 200 mb since it is large biomes and so i need to travel quite far to get to the plains for horses or to the swamp for slimes etc. etc.)
last time I played around 400 extra ocelots had spawned above the 400 that were already there (total count of enitities 1000 but i have some item frames and other entities ofc)
if anyone could help me to use the in-game coords to get the right region files i can send the exact region(with my beautiful tree house with mine-cart rails to my mines and some wooden horse bridges
seed: -6294889212756226575

Should be fixed according to https://twitter.com/Dinnerbone/status/332879071094644736

Confirms fixed. Leaving the area now despawns Ocelots and reduces them to normal numbers.

I have this bug in 13w19a with ocelots and chickens.

must be in next update

This may need to be reopened. There are many reports of out-of-control ocelot spawning in recent 1.6.1 builds of CraftBukkit, and comments from Bukkit staff on the issue (https://bukkit.atlassian.net/browse/BUKKIT-4449) suggest that this is a vanilla bug.

it should be fix in 1.6.2!

Cannot reproduce with vanilla 1.6.x server & client.

There's a couple of different things going on here.
In 1.6, ocelots and wolves not have a 2 minute "don't despawn" period where they will persist even if there are no players nearby. If you build a holding pen, use a spawn egg to spawn in some ocelots, and fly straight up over 128 blocks, then I can reliably reproduce that ocelots won't despawn before this period, but will despawn after it. So there's no bug with ocelots *de*spawning, per se.
However ocelots do seem to be spawning more which, combined with the 2 minute immunity, means there are many many more ocelots being encountered. Whether this is a bug or intended behaviour is something only Mojang can answer.