Go to biggest bookstore around, spend hours. This is what I do at least once a month. Same thing for English book (which I can only find as e-books); go to B&N site, spend hours browsing and reading samples.
I believe you should find new books hard way. Not by reading reviews and such. But still I do read reviews too. Only from these sites:
http://www.sffworld.com/
https://www.kirkusreviews.com/
http://www.strangehorizons.com/
Also follow magazines like Asimov's.