The upcoming new Picanto has also only ever been photographed in five-door format, suggesting that the industry trend for dropping small three-door cars may continue on the three-door versions of the Picanto and Rio.
Inside, the new Rio's dashboard is uncluttered, with sweeping lines and a mix of pale and dark materials. Metallic trim adorns the centre console and highlights other interior pieces.
Exterior details are mirrored on the inside; the air-con vents follow the same angular design as that of the tail-lights, as do sculpted dashboard panels. A large, central touchscreen dominates the dash, although the sketch reveals little in the way of detail.
Engines for the new model are yet to be announced, but updated versions of the 1.25 and 1.4-litre petrol engines, as well as a 1.1-litre diesel engine are likely to be used. New to the range will be a 1.0-litre turbocharged three-cylinder petrol engine, as used in the C'eed. That engine is also likely to make it into the Picanto.
Trims will almost certainly follow the 1, 2, 3 and 4 pattern currently used by Kia across its line-up, with the possibility of a high-spec, sportily styled GT Line trim level at the top.
The Rio GT, Kia's answer to the Ford Fiesta ST, will also appear in the Rio lineup in the future. A 1.4-litre turbocharged petrol engine, revealed by Kia last year, is tipped to power the hot hatch.
Read more about Kia's raft of hot upcoming models here
The text accompanying the images of the Rio also gives little away, aside from saying the front overhang and wheelbase will be longer than those of its predecessor. Pricing is very likely to increase over the current-generation five-door Rio's £10,945 price tag; an entry-level price of nearer £11,500 is expected.
Production of the Rio will begin towards the end of this year for European markets.