I am booked on a Virgin flight from DEL (New Delhi) to JFK (New York) with a connection at LHR (London) for Dec 17. Virgin presumably canceled the 12/17 flight and has automatically rescheduled me for the flight on the next day....12/18, but they did not also change my (LHR-JFK) connecting flight, which is still scheduled for 12/17 and which I will miss.

Here are my questions:
1) I noticed that Virgin did not also automatically change my connecting flight from LHR to JFK to the next day like they did for the first segment. WHY do you think this is the case?
2) Virgin did not notify me of the flight change (I only found out about it by chance when logging on to their web site.). WHY do you think they did not inform me by e-mail? Is it because there is a reasonable chance they will restore the original flight that presumably is currently canceled?
3) I was originally booked on Premium economy. If I choose to travel on the next day (12/18), will they give me a free upgrade to business class because they caused a change in my travel plans?
4) Am I eligible to cancel the entire flight (for both segments DEL-LHR and LHR-JFK) for a FULL refund so that no cancellation fees and penalties apply (since they caused the problem)?

Thanks in advance.