For those who enabled developer preview on their Windows Phones and have Windows 8.1 Update 1 installed can check now for an update now. Microsoft just pushed another update for Windows Phones with developer preview.
The new version 8.10.14157.200 says
Windows 8.1 (8.10.14157.200) Preview for Developers Update – This update can help make your phone work even better.
After installing the update we could not find any noticeable changes so far.
If you have enabled developer preview, then check for an update from Settings=> Phone Update=> check for update.