Sony sales may lag; Comcast and Time Warner expected to surprise positively.
Shares of the drugmaker are trading in 4-star territory ahead of its earnings announcement Friday.
Abbott shares are trading in 5-star territory ahead of its quarterly earnings announcement.
Investors await clutch of key earnings.
The firm's advertising business and proposed Motorola Mobility buyout may be under scrutiny.
Weakness in consumer demand and rising costs could weigh on results.