Hello I am new to FT I was wondering if I could get some opinions on a few things. But before my questions I will layout the story.

I have booked
LUX - CPH - PVG
PVG - CPH - LHR

08/12/14
LUX-CPH 17:40 - 19:10 SK2584

09/12/14
CPH-PVG 18:25 - 11:45 SK997

17/12/14
Back to London which is not too important.

I was wondering?

If I take an Easyjet flight from LGW - LUX to arrive in 16:40 I will have a 1hr connection. I will have only hand baggage. Easyjet has had a good ontime rating.

1.) If I get delayed will SAS put me on the 10am out from LUX-CPH tomorrow?
2.) How much will that cost me? Will they rebook the entire LUX-PVG segment or just the first flight.
3.) My CPH-PVG segment may be upgraded to SAS plus by OT. Will that effect anything?
4.) As with regards to OT, if I get upgraded to SAS Plus can I claim 200% miles on another FFP like Miles and Bonus?

Thx