An interesting revelation has come about this morning, with Team Lotus announcing that Karun Chandhok will replace Jarno Trulli. It looks like Trulli will be back for the next GP in Hungary the following week, so it isn't a long-term replacement, but they could be looking towards the future.
I'm personally very happy to see Karun given a chance. I honestly think anyone driving a HRT last year, could not be judged either way. He certainly didn't do much wrong with the car he had that was notoriously hard to handle. It will make Karun feel good who recently has been battling in the press with Force India owner Vijay Mallya, who essentially said Karun didn't deserve a place in F1.
It will be a tough test for Karun, as the cars and regs will be quite different to handle this year, with the tyres especially being difficult to nurse over a race distance. His few runs in practice will held him in good stead, however, it will be unrealistic to expect him to match Heikki. If he can somehow manage to match him or beat him on merit then it will be very impressive.
For Jarno, I think it makes sense as he has not been a happy bunny in recent races, complaining about the power steering. The power steering will supposedly be fixed for the next race at Hungary, therefore he may not even mind having the week off and then coming back to a car that he will actually be happy driving.
Crucially, this will give Karun a race before he races at the India GP (which has already been unofficially confirmed) and it would be great if he can put in a good performance in front of his home crowd. He is a very likable guy and I will miss his commentary on 5 live, but I'll definitely be routing for him to do well.