so with TAR 15 filming way past done and getting ready to air, and with TAR 16 gearing up to film later this Fall (October/November, i can't really remember which month), should we start looking at other new possible locations?
One obvious place to look is in Eastern Europe.
it seems they've used at least one "Eastern European" country in every season since season 5.
this does exclude TAR 13 (Kazakhstan came closest to new Eastern Europe, but is in fact, in Central Asia), and to some extent TAR 7 (although Istanbul is in Europe, Turkey is part of Asia Minor)
so here's my list of possible countries (most to least likely IMO):
Bulgaria
Slovenia
Latvia
Montenegro
Serbia
Slovakia
Azerbaijan*
Uzbekistan**
Cyprus*
Macedonia
Bosnia
Albania
Belarus
Armenia*
Georgia*
Tajikstan**
Turkmenistan**
Moldova
Kyrgyzstan**
* goes along with Turkey in the Asia Minor "Europe"
** goes along with Kazakhstan in Central Asian "Europe"