I am building a new hardtail so have been keeping a close eye on prices when this deal popped up.
Groupset includes everything except for rotors;
SLX Crank
XT BB
SLX Chain
SLX Cassette
SLX Brakes
SLX Levers
SLX Shifter
Price comes down to $484 after the additional 7.5% discount is applied (unsure how long this extra discount lasts).
XT Set is available for $550-590 depending on chain/cassette choice
Just observing, looks like the crank is fixed 175mm, may not suit some configs