Well it had to be the Walking Dead 171 didn't it, what I didn't realise though is that there are 2 cover Bs one normal and one with a pink signature which have 7 extra pages of story. These seem to have been put into LCS's piles randomly.
The extra 7 pages are in fact a preview of issue 172 but coupled with a new character first app these will, I think , be highly sought after.
As they were completely randomly inserted we have no idea of print runs just yet!