If earnings are bad on the 19th (bad vs. expectations. we all know they're not going to be pretty) the selloff could last for a day or two after that. That's the hangover effect.
If Nokia provides guidance it will be more important than the numbers they release. Nokia has said they are not providing forward guidance, but they can at least discuss a timetable for structural changes within the company. Everybody wants to hear SOMEthing about NSN. And we want the actual sales numbers for Lumia phones. If we don't get that, folks (me included) will be certain they're hiding bad news from us. Who is going to buy a troubled stock with no information on how bad that trouble is going to be moving forward?