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Electoral Districts Boundaries Census Data Data Archive - lots here
The datameet group has released a set of shapefiles, which includes the state of Telengana as separate from Andhra Pradesh: http://github.com/datameet/maps/ The data is shared under Creative Commons Attribution-ShareAlike 2.5 India license.
I found states, districts and tehsil info from the below path and the details are upto date (as of Aug 2015) http://questionbox.in/india-state-district-sub-district-database-in-excel-csv-and-sql-query-format/
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