Mercedes motorsport boss Norbert Haug has played down suggestions that the team's new W03 will have some groundbreaking features.
The Brackley-based squad opted to skip the first test in Jerez and media reports suggested they were trying to hide a "clever new front wing" from their rivals.
Pictures that emerged from the team's shakedown at Silverstone last week showed that the new car has a stepped nose, but no other obvious innovations were spotted.
All will be revealed at Barcelona's Circuit de Catalunya on Tuesday though, as the team will launch their new challenger shortly before the start of the second pre-season test.
"I don't think that your eye will be caught by any big surprises when you see the car during the unveiling," Haug told Autosport.
"But I certainly hope that we have some clever solutions and we have some good ideas incorporated on the car.
"It's a good base to work from and certainly we will not turn the world upside down, but we do need to make a good step [with this car]."
Mercedes, who completed a private test with the new car at Barcelona on Sunday, are determined to move closer to Red Bull, McLaren and Ferrari this season after finishing a distant fourth the past two campaigns.
"I wouldn't say that it's a new start," said Haug. "This car is the product of what we have learned in the last two years.
"We had three podium finishes in the first year, but last year we did not head in the right direction. We had some highs, like the Chinese Grand Prix when the track was front-tyre limited and the performance was a little better. But over the course of the year it wasn't good enough.
"To be a regular contender with Red Bull, Ferrari and McLaren is quite a task. We need to learn, we need to develop our team in that direction and I'm sure that we can do that."
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