Tell me... how can they test the new components? Without violating the testing ban, which lasts until 01/01/2010?
Also, cargo arrived for McLaren this morning with new components in it apparently.
Trying out new parts in races or race weekends, is no big deal. What would be a big deal if they turned up with a totally new diffuser (this is a major part), without having tested it in the the testing sessions which only ended a week ago. If they do this, then its definitely pannick stations.
If the team were happy with their car and were planning on a major upgrade (like a new diffuser), the way to do it would be to test it on a Friday on Race1, but not use it in the race. Then take the data back to factory and come back on Race2 with the car fully incorporating the new car part OR a further test on the same or modified car part.
To simply turn up with a major new car part, without any testing and using it in the race is a big gamble and would show that they are definitely not happy with the car.