backdraft7 - 1:33 pm on Dec 24, 2012 (gmt 0)
Let me thrown in on this topic because rather than speculate, I can tell you from direct recent experience how Google may handle your situation, which may be different from how they handled mine.
1. About three weeks ago, my host sent out a letter saying in 48 hours they are going to move our server. I was out of town at the time so I never read that notice. When I returned home, my site was broken. Scripts had to be reconfigured, yada-yada-yada. I was out of service for about 3 days as they had changed my IP's and the last to recover is always SSL (required for my order form). Once I recovered, traffic had taken a huge hit. Google had also de-indexed over 30 number one listings I had held for years, not de-ranked, de-indexed as in GONE.
In desperation (as usual) I thought that implementing a CDN might help eliminate the possibility that my site was now slow due to the server move (my host had promised higher performance servers in the move, but in checking MUNIN I see they removed 500Mb of memory from my server, I figured they probably also put my server on a dial up connection).
So, I used (cloudfl...) as my CDN. Another nameserver change and three more days of dns propagation outage. As I was reading up on CDN's I discovered that GOOGLE is also entering into the CDN business (like facebook and all the other businesses they want to be). When dns finally settled out, if found I lost even more in the serps. It's been a week and since whatever recent update has come through, it apparently hit at the perfect time, knocking me nearly out of the serps completely. It's as if I've now been penalized for using another CDN service than G's (even though theirs is still in beta)
My webmaster tools page showed most of my pages in error as unreachable. I cleared those errors and am hoping I return. I'm actually not very optimistic that I will.
So, good luck on your move...you typically won't be affected, but if you get preferential torture like I do, then your results may be otherwise.