The launch of the new top-shelf hatch is likely to coincide with the unveiling of the 1 Series three-door body, shown here as the 135i and in earlier shots of the lesser variants.
Expect the new model to pack the same 225kW/400Nm turbocharged inline six-cylinder petrol engine that drives the 3 Series and the old 135i.
The recently-revealed M135i "concept" could also debut in three-door form, which delivers "more than 300hp (225kW)" and will likely form part of the enhanced M Performance range when it hits showrooms.
The car spied here is wearing the same bits fitted to the M135i concept, including larger 18-inch wheels and M styling elements.
With the three-door 1 Series on the way, will we see a Coupe and Cabriolet in the range?
While those bodystyles are likely, reports over the past year suggest BMW will give the pair a new 2 Series badge and their own unique styling.
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