I've been looking at the pot 1 permutations (seeds), and whilst some teams may think about relaxing if they have already qualified, the next couple of games could decide if a few of them are seeded or not.
The seeding process is fairly complicated at first sight, but my guess would be that France, Spain, Germany and England will make pot 1, leaving Belgium, Italy, Portugal and Netherlands fighting for the last two places in pot 1 (given qualification).
That means two of the four could well be lurking in pot 2, again assuming qualification.
http://www.footballseeding.com/national-ranking-uefa/ranking-2015/#Sort