Yamaha has introduced the WR155R in Indonesia and there seem to be high hopes it will come to Thailand too:
Some spec's:
The dual purpose Yamaha WR 155 R measures 2145mm in length, 840mm in width, 1200mm in height, 1430mm in wheelbase, with 245mm of ground clearance, seat height of 888mm, a kerb weight of 134 kg and a fuel tank capacity of 8.1L. The engine on this model is a 155.09cc, single-cylinder, liquid-cooled, 4-stroke, SOHC motor producing 12.3 kW of power @ 10000 RPM and 14.3 Nm of torque @ 6500 RPM matched to a 6-speed gearbox.
The bike is built around a semi double cradle chassis riding on 41mm telescopic front fork and a rear monoshock with a 21″ front wheel and an 18″ rear wheel. The bike gets stopping power from disc brakes both at the front and rear.
khaorot.com
Price range will hopefully be similar to the KLX150 BF around 90K baht?!

Some spec's:
The dual purpose Yamaha WR 155 R measures 2145mm in length, 840mm in width, 1200mm in height, 1430mm in wheelbase, with 245mm of ground clearance, seat height of 888mm, a kerb weight of 134 kg and a fuel tank capacity of 8.1L. The engine on this model is a 155.09cc, single-cylinder, liquid-cooled, 4-stroke, SOHC motor producing 12.3 kW of power @ 10000 RPM and 14.3 Nm of torque @ 6500 RPM matched to a 6-speed gearbox.
The bike is built around a semi double cradle chassis riding on 41mm telescopic front fork and a rear monoshock with a 21″ front wheel and an 18″ rear wheel. The bike gets stopping power from disc brakes both at the front and rear.

Yamaha WR155R 2020 เตรียมลุยไทย คาดการณ์เปิดตัวปีนี้
Yamaha WR155R 2020 วิบากไซซ์เล็ก พร้อมลุยถนนเมืองไทย โดยคาดการณ์ว่าเปิดตัวในไทยปีนี้ โดย Yamaha WR155R 2020 มีราคาจำหน่ายในอินโดอยู่ที่ 8.3 หมื่นบาท

Price range will hopefully be similar to the KLX150 BF around 90K baht?!