Judging by this national teams coefficient overview, the teams who made it to the 2nd place playoffs in Europe rank as follows :
1) Russia
2) France
3) Portugal
4) Greece
5) Ukraine
6) Rep. Of Ireland
7) Bosnia and H.
8) Slovenia
Now if Fifa wants to employ the seeding system I think that the teams should play like they do in the NBA playoffs 1-8 2-7 3-6 and so on, so that would make the possible match ups look like this:
Russia - Slovenia
France - Bosnia
Portugal - Ireland
Greece - Ukraine
I'll be damned to see what matchups fifa comes up with and how they rationalize them. What I proposed in the posts above is that they just do a regular draw(8 balls in one pot) and play football, only since Fifa made the last minute change about seeding.