Sample Company
"Next Year" is not open
Fiscal Year: Jan 1 - Dec 31, 2008
Open the company with a date: 12/31/2015 (or earlier)
Next, select Reports > Trial Balance
Note the Fiscal Period that is defaulted (It is: 2008 - 12)

Repeat the above, with a sigh-on date of 01/01/2016 (or later)
Select Reports > Trial Balance
Note the Fiscal Period that is defaulted (It is: 2008 - 1)


Tried this with client data with a fiscal year-end of Oct 2014 and "Next Year" is open - same results.