The online 2015 ORS will appear shortly, at least we hope before the official start of the 2016 Legislative Session.
The official PRINT ORS is available at law and public libraries around Oregon. (But call first to make sure your library has it in print. Not all libraries get the official print version.)
Note that any legislation passed in the 2016 and 2017 Oregon legislative sessions WILL NOT appear in codified format until the 2017 Oregon Revised Statutes are published in late 2017 or early 2018.