When do the county subdivision estimates come out? June?
Technically it is incorporated place and minor civil division (i.e. legal entities).
Hopefully, I'll find the time to update the maps I made last year, like the 2014-2015 Percentage Change Map
for those incorporated places, minor civil divisions (and CDPs?).
The American Community Survey does produce estimates for other census geography down to the Block Group level. The sampling used for the ACS is designed to produce statistically valid results for such small areas - if you use the 5-year sample. So for CDP's you could get an 2011-2015 estimate. Perhaps not so useful for population total, but useful for other social characteristics.
For small population cities (a couple of hundred) the census uses a higher sampling rate for the ACS.
The ACS also produces results for things like congressional districts and legislative districts. For some of these, you may be able to use one-year samples. The census bureau knows where their samples are from and they could produce estimates for a census block, but a 4-household sample for a block with 20 houses is not a very good sample, and would break confidentiality anyhow. But they can aggregate samples for larger areas. For example, they have produced CVAP estimates by race for various congressional district plans in Texas.