I have noticed over the past couple of days a rather large increase in first posts by new users. Especially new users who haven't earned the bronze badge for taking the Tour.
The badge is 'informed', for those who don't know. I usually only check for this if I'm going to post a cookie-cutter comment about "Please take the tour", which I'm inclined to do:
Ever since I have been doing this, which is probably a couple of years, a clear majority of these cases haven't taken the tour (maybe 90%+ of the first category, and 70%+ of the second). I don't know what the broader average is, but I think pretty high.
There is a bit of a caveat since people who are already members of other exchanges likely do not bother. I don't have 'informed' most places I've joined; I'm more likely to have just looked at the local "on/off topic" page.
WRT to spiking, I can't say whether this is true over the past couple of days, but in the longer term I'd say the number hasn't increased dramatically. It's pretty normal that there is a small handful of "questions posted as answers" (which, if caught, all come to the attention of a moderator) on a daily basis. Sometimes stuff like that does seem to spike in the short term, but I think that is mostly happenstance. Likewise, in a 24-hour period I can pretty much always at least a few unclear or too broad questions from a new users who have't taken the tour.
The "questions posted as answers" are easy to deal with. The inappropriate questions take a little more time, and of course it would be nice if more people did take the tour and this reduced that number. I'm not sure that it would, however, unless the tour were a little more emphatic, since I would guess this is the product of tunnel vision and optimism of the sort whereby "this will be okay".
1. Those get deleted, but the poster should still get the comment. A perhaps interesting behavioral observation about that is it seems to me 90%+ of people who are told, "this is not an answer to the question...please take the tour...you can ask questions via the "Ask Question" page, linked top right" never repost their question as a question. Go figure.