If someone gets dental implant immediatly after extraction. Is there any risk of face shape changes? Even slightly?

Maybe. Face changes are always possible with the extraction of any tooth. That is why it is always best to replace missing teeth ASAP. If any changes do occur, they will probably be minimal.
Implant. An implant will actually reduce the chance of facial drape change by preventing bone loss. Once the prosthesis has been completed, and a crown placed on the implant, you will have exactly the same shape as before the extraction. Very rare to see face-shape change following single extraction. More probable if there are multiple extractions of adjacent teeth.