Can't say I have seen ANY changes to the positioning,colour,font or layout of the adwords.
Have you used a different PC, screen than normal, or was this a geo-targeting excercise of some kind, not replicated across the world.
maybe other members have notcied changes, although i am sure we have had false alarms like this before and never worked out what was going on.
And I definately do NOT think it has anything to do with the update.
I would be very surprised if the adwords team actually knew when the update starts or even finishes.
(I did think about saying thet they probably do NOT even know what the update actually is, but there again there are some things 1 just should not say, when U KNOW THEY R READING)
Shak