It was stated that the official Minecraft plugin API will not provide direct access to chunks, because Chunks are just internal data objects:
[Mojang] Grum (Erik Broes) added a comment - 04/Oct/12 8:08 PM - edited
You shall never hear of chunks again with the coming api. However there should be a way to keep areas loaded for some mechanics. Abuse will be up for control by the person using this feature as there is no way of telling what is considered good or bad behaviour.
Things like ticking of blocks should be handled a bit more elegantly; ideally, blocks should register when they want to ‘tick’ rather than tick randomly. The world should store these queued times and possibly fast-forward through them when they load again.
See https://bugs.mojang.com/browse/MCAPI-31
I think the Sponge API should also follow this convention to be compatible with the official API.
A special case are Bukkit’s 16x16 byte arrays for world generators, used for performance reasons. If we don’t want to use chunks at all, we also need a replacement for that…