Happens once in a while if it is a positioning flight. The only definitive way to tell (other than after you enter the aircraft) if you're getting Biz seats on a Konnect flight (presuming you're booked in one of the first few rows) is to look at the livery on the outside of the aircraft. If the word "Konnect" is added above "Jet Airways" then its retrofitted with all economy seats, else you have biz seats. The only other (and unreliable way) to tell is when you web check-in, the middle seats in the first few rows appear to have already been taken. But like I just said, VERY UNRELIABLE.

Nevertheless, I always look for the first few rows (preferably aisle), so I do end up lucky once every now and then.

Yes, they don't give you blankets. In fact, until a month back, they were giving out small bottles of water which they've stopped now - these days you've got to ask ask, and then you get water in a paper cup.