For the next week Injections, EIA each Thursday afternoon have a supply/demand report:
http://www.eia.gov/naturalgas/weekly/#tabs-supply-2
Also professional NG trader can calculate the Injection yourself according to HDD and CDD NOAA post each week:
ftp://ftp.cpc.ncep.noaa.gov/htdocs/temp/wfheat.states
ftp://ftp.cpc.ncep.noaa.gov/htdocs/temp/wfheat.states
Also Ben from First Entercast post his estimate Injection each Monday, the week link:
http://www.firstenercastfinancial.com/forums/showthread.php?t=2859
First Entercast has daily injection model:
http://www.firstenercastfinancial.com/energy/
My estimate for next week should be >94B. and the next 3 injections report will largely remove the Inventory Deficit. By end of Nov, the Inventory will be over that of last year, by end of Dec, the Inventory will be over that of 5 years average.
good luck!