Steve C
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To give you an idea of the "instant" spread... the pigs used to be (and still are) contained in the top center just to the left of the red structure. (They still are but aren't rendering due to the distance). The enclosure has never been broken. However, suddenly, they are all over this part of the base - see on the bottom center and on the left - the pigs are visible. This isn't the only place, just the only place that is rendering at this distance. They are everywhere. Like flies. Shouldn't be possible.
Win 10 Beta - creepers that are named despawn - confirmed. I can't keep creepers in my pits because even if nametagged, they despawn.
It might be working, if you take into account only 6 hostile mobs can be within your spawn sphere at one time.
I've done some testing. I built a mob spawner on Windows 10 Beta edition, and it didn't seem to be working as well as the videos on YouTube, but it did spawn things once in a while (rarely), but then it wasn't in an area that prohibited spawning in other places (caves for instance). Then I built a donut shaped spawn platform that started at 24 blocks and went to 36 blocks away from a central point out in the middle of an ocean. It had walls so nothing that spawned on it could escape. At no time were there more than 6 mobs. I built pits out in the middle of a large plains area. When mobs would spawn on the plains I would kite them into the pits. I collected 6. So long as I stayed within 36 blocks, they would not despawn, but no more mobs would spawn.
Also the only reason I assume they "escaped" not "appeared out of nowhere" is that the villager enclosure only had a handful of villagers after I logged in. First thing I checked. There used to be many. Like, many many, and now they are all running around the base randomly, but the glass enclosure (still intact) only has a tiny number. The pig herd also looks very thinned out in the enclosure. So it appears the "Free" ones came from the enclosure, somehow...