I think I will give you my practical tips because none of us know how we will feel when an expected death occurs, for some its part relief, but I will say that we found Cruse Bereavement Care really helpful both practically and emotionally.
We lost FIL during Christmas 2012. He was in intensive care, non treatable cancer so we knew it was imminent. There was the inevitable visiting schedule, and sadly some arguments about who got to visit first and for how long. What can I say, people focus on strange things in these moments.
We (DH and I) had DH's elderly gran staying, along with SIL and BIL and five yo nephew. My parents came over too and just helped - they listened to gran's stories repeatedly (and patiently).
We did easy food - buffet stuff, cold leftovers, that sort of thing. Less prep, hassle and only plates to wash up. We didn't have the energy for grand meals. No-one minded except SIL who decided it was hugely disrespectful for us not to have made a huge roast dinner. I decided it was her release of tension and distraction from the real issue which was her dad.
We'd pre selected DVDs to watch, as lots of Christmas films are so sentimental and tear jerkers that we wanted to avoid them. As we had nephew some were obvious like Cars or similar. Don't watch Up, we did and cried pretty much all the way through the old man's back story part.
DH and I had agreed before that if he needed time out then I'd hold the fort, and he'd sneak off upstairs for a bit. We encouraged lots of short walks to the swings, to get fresh air and also to diffuse some tension between people.
We didn't commit to our usual meet ups with friends and neighbours, no-one minded and we're happy enough when we said just to catch up for a cup of tea when we were ready to face it. There's no way we could have faced busy pubs or restaurants at New Year.
Just keep it simple, was the motto. To be honest we've never really gone back to very extravagant Christmases since, you don't need a lot of the gumph that just clutters up the place or is wasted.
Be kind to yourself, make sure you do the basic self care stuff. 

