Do we have any idea of which freshmen are redshirting this year? (Sorry if this question's already been asked)

Not mine.  Rick Jones, who runs the Rivals site and has been to practically every practice session.   His guesses of who will travel w/ the squad to Pullman.  That's not an automatic ticket to playing, but if you're not there in the stadium, your chances of playing are zip.  And of course, if they burn your shirt early, you'll see some playing time the whole season.

Shayne Skov
Jarek Lancaster
Both running with the #2 LBs in practice.

Stepfan Taylor RB
Josh Nunes  QB  
Taylor looking very good and Nunes goes in case total catastrophe hits our QBs.  Harbs said somewhere Nunes will play this year.

Jones also figures that Drew Terrell and Jamal Patterson , both WRs will travel.

So that's six out of a class of 21.   You could chip away from the other end, i.e. guys who are highly probable redshirts

OL  Danser
DT  Stephens
OL  Wilkes
DE  Gardner
DE   Murphy
TE   Najvar
TE    Hewitt
DE   Mauro
LB    Meinken
CB   Brown

Guys who might play but are hurt/nicked up   or just on the cusp

TE Toilolo
RB Amanam
RB Gaffney
TE  Ertz
WR  Jemari Roberts

If Nunes plays this year, it will be because the staff doesn't think Loukas is coming back any time soon. And in that case, I'll bet Nunes redshirts next year.