Doom wheel clarified. It can pivot and wheel like a chariot (only once during a 'charge') but does not have to see the target to charge them. I.E. it can contact a unit behind it but it CANNOT circle a unit to hit another facing beyond the one it started in.
document is located here: http://www.games-workshop.com/MEDIA_CustomProductCatalog/m1000262a_FAQ_Skaven_Mar2010.pdf
Think that's the biggest ERRATA section I've seen from them in a long time.