I suspect Woody will try to get players for 4-3-3, since the mythical PowerPoint presentation at his job interview was all about how we'd become the Liverpool of the north (east). The 3-5-2 formation doesn't tend to stay in vogue for long at any club, even though I really like it when deploying box-to-box wingbacks. Ironically, it would arguably suit Liverpool better than 4-3-3 does, as Robertson and Alexander-Arnold can cover every blade of grass and put some wonderful crosses in. They could easily lose a player in midfield and add extra presence in their defence if they switched to 3-5-2.
Back on topic, we've needed width and striking options for the last few windows, and nothing's been done about it. If we don't approach these positions as the only priority in January (barring maybe bringing Ben Gibson back on loan, and assuming Randolph stays), we'll get nowhere in the second half of the season.
I've just watched it back as well and think it definitely looks like a penalty... Plus reading the Forest forum they believe it was awarded correctly mostly blaming Robinson for a very poor challenge. Credit to McNair as both the defense splitting pass and penalty are spot on!