Hi there,
The 2800 and 3800 series will have used 'Enhanced Location' using external antennas. There is not to much info on how it works, or when it will be available.
http://www.cisco.com/c/dam/m/sl_si/events/2016/cisco_dan_inovativnih_resitev/pdf/20160420_ciscoenterprisewirelessupdate_ciscodayslovenia.pdf
For now you are stuck using the 3600 and 3700 APs with the Hyperlocation Modules.
Regards,
Brett