The phone, announced at the Mobile World Congress in Barcelona, will be known as the BlackBerry Q20 and will boast a tactile keyboard and trackpad, according to BlackBerry boss John Chen.
"Virtually everyone I meet says they love our keyboards. I call it the 'BlackBerry Classic'," said Mr Chen.
The Canadian firm also unveiled plans for a budget handset intended to ratchet-up sales in the booming Southeast Asian mobile market.
Mr Chen said that the phone, to be known as the Z3, will sell for less than £120.
The device will launch in Indonesia in April before it is rolled out across the rest of Southeast Asia, Mr Chen told reporters.
The announcements mark the beginning of an ambitious plan intended to return the firm to profitability by cutting manufacturing costs and increasing lucrative government sales.