HTC highlighted the cameras on its upcoming flagship phone, calling them "world class" in Twitter post. "World First, World Class, Front and Back. You'll see. #powerof10" HTC posted on its Twitter page Tuesday, with a graphic of two camera lenses.

HTC began using the slogan "Power of 10" in early March to promote what is believed to be the company's new flagship product to succeed the HTC One (M9) model -- possibly the "HTC 10."

HTC's new smartphone is rumored to image stabilizers for both front and rear cameras, which would be a world's first. Other expected features include a 5.15-inch Quad-HD display, a Qualcomm Snapdragon 820 processor, 4GB RAM, a 12-megapixel rear camera and a USB Type-C port.

HTC is running a campaign on its Facebook page for the Taiwanese market, which runs through April 15. An official announcement should be expected 4 days later.