Hi Sophieselt!
If I recall correctly, F/W stuff should arrive late June or July. I remember buying IM fall pieces at that time, but it might depend on where you're located. I assume Europe gets stock slightly earlier than US/Canada.
As for colours, I think she always does black and possibly white/ivory, but all the other colours are seasonal. This is the first time I've seen khaki but I don't keep track that closely. I doubt it will be repeated but you never know. If you love it, I say grab it now. I'm eyeing the blue chambray myself.
Hopefully, other IM fans will chime in.
I'm glad you're enjoying the Ghazo!