is any developer working on jellybean and root for this phone
I don't know about Jellybean, but here are root instructions taken from my post in another thread.
first download USB Drivers from here:
LG LG730 Support: Find Manuals & Warranty Info | LG USA
Install phone drivers
enable USB Debugging Mode on your phone (system settings-> Developer Options
enable installing from unknown sources (system settings -> security)
download root kit (also linked in original post)
Root_with_Restore_by_Bin4ry…zip (4,14 MB) - uploaded.to
unzip above file into c:\LG_Venice_Root (you can use a different location, but will need to modify the next step accordingly).
Open a command prompt. windows Start Menu, type [CMD] (do not type the brackets] in the search/run area
within the command prompt that opens
[CD LG_Venice_Root] [enter]
Verify that drivers are installed properly and phone is connected. Within command prompt type:
[stuff\abd devices] [enter]
your phone should be listed. if not re-install drivers
Run script to Root Phone. In command prompt type:
 enter (for normal root)
Turn on phone (if it went to sleep) and select RESTORE ( i believe the button was on the bottom right of the screen).
Phone will reboot once or twice. When it loads back up you can verify it worked by opening your Apps. If you see SuperSU you should have root access.
DO NOT UNINSTALL GOOGLE MOVIES OR GOOGLE BOOKS. You will brick your phone. You can try removing other pre-loaded software at your own risk.
Root, but no ROMS.
Separate names with a comma.