RE:RE:RE:RE:RE:RE:SpudHi Waitingstill,
The difference in days is really not significant so I wouldn't look for any hidden agenda, change in plans etc as an explanation here; it is not a material change.
They probably prefer giving a reasonably sure date for having some results; 85 days from spud date is "late november", visibly they preferred stating "early december", like, right after lunch you tell a buncha friends you'll see them around 8 for a few pints, sometimes you go there at 7:30 sometimes at 8:30, no big deal, is it?
So for me there is really no hidden meaning here to cudgel one's brains, relax.